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Investigations of Rhinoceros Beetles in West Africa' Investigations of Rhinoceros Beetles In West Africa' CHARLES P. HOYT2 IN APRIL, 1959, the author was sent by the During the dry season in Sierra Leone and in South Pacific Commission to the countries of parts of Nigeria, it is the practice to burn off Sierra Leone and Nigeria, West Africa, to con­ the bush to clear the land for planting. The oil duct an investigation of the natural enemies of palms in these areas are usually not affected by the various species of Oryctes (Coleoptera, the fires, and the larvae .of Oryctes and other Scarabaeidae, Dynastinae) occurring there. The beetles within the standing rotten trunks are object of this study was to find and introduce not harmed. to the islands of the South Pacific suitable para­ The low-lying land of the southern part of sites and predators of these beetles in order to eastern Nigeria is divided by numerous slow­ establish a biological control over the introduced moving streams which give rise to large swampy Oryctes rhinoceros Linn. which has become a areas as they wind their way towards the sea. serious pest of coconut palms in the area. Because of this and the heavy rainfall, extensive In Sierra Leone and Nigeria, coconut palms burning is not possible. In the swamps are dense are confined mostly to village sites; the groves stands of Raphia palms which flower and die, are from 15 to 50 palms, depending on the size providing a continuous supply of breeding sites of the village. Because of this, nearly all the for Oryctes. The higher ground between the work was carried out on oil palms (Elaeis gui­ streams and swamps supports large stands of oil neensis Jacq.) which, together with the Raphia palms, both cultivated and wild, from which palms of the swamps, are the most important come the main export of the area in the form hosts of the species of Oryctes found. The oil of palm oil and kernels. palms occur in an extensive belt that follows the coast of West Africa and extends inland nearly PREDATORS AND PARASITES ENCOUNTERED 100 miles in some places. There are two distinct climatic seasons in N eocbryopus savagei··Hope (Coleoptera, Cara­ West Africa, and these greatly affect the insect boidea, Scaritidae) populations. The wet season begins generally at the end of April and lasts until sometime in The large scaritid beetle N eochryopus savagei September. By the end of November the dry was first found in Raphia palms growing in the season has set in, and from then until April swamps at Umudike, near Umuahia, eastern little or no rain falls. At times the rains will Nigeria. In April, 1960, an adult beetle of this cease in August and commence again in Sep­ species was found inside a standing rotten tember, but during 1960 this type of rainfall Raphia palm trunk where it was actually en­ did not occur in Nigeria. gaged in feeding on a larva of Oryctes ohausi Insect activity begins with the coming of the Minck. A search of other rotten palm trunks in rains in April or May and gradually ends in this area turned up two large larvae of Neo­ November or December. There are, of course, chryopus. Afterwards, additional adult speci­ many exceptions to this; some species seem to mens were recovered from the debris which be found only during the dry season and others normally collects in the old dead leaf bases just congregate along streams and in swamps, giving below the crowns of oil palms left by workers a false impression of their absence. engaged in cutting the bunches of fruit in a grove of palms on the Agricultural Station. This 1 Presented at the Tenth Pacific Science Congress, accumulation of rotten organic matter provides Honolulu, Hawaii, 1961. a breeding site for Oryctes sjostedti Koble, and ' Technical Officer, Pests & Diseases, South Pacific Commission, Noumea, New Caledonia. N eocbryopus breeds here and preys on these Manuscript received March 19, 1962 . dynastid grubs . 444 Rhinoceros Beetles in West Africa-HoYT 445 Data obtained from the examination of field­ males are apparently adapted for grasping the collected larvae of N. stWagei indicated that female around the back of the head during there were five instars. The length of the fourth copulation. However, both sexes feed readily on instar period of a single larva provided with 'scarabaeid grubs. a constant supply of small cetonid and Oryctes The sex ratio was found to be 1 to 1. Usually grubs was slightly over 2 weeks. The pupal one or two adult beetles were found in the period was 10 days. Several of these scaritid debris of an oil palm, but on one occasion four larvae lived 3 weeks without food. Considerable were taken in a single site. No figures were difficulty was experienced in hatching the eggs obtained on the sexes collected from individual laid by captive adult beetles and rearing their palms; the ratios were calculated from total larvae in the laboratory because both stages were field collections. frequently attacked by fungus. In the case of the The majority of the beetles were collected larvae this fungus appeared to be a Metar­ from the oil palm debris; however, a fairly large rhizium. number of both adults and larvae were also The adult beetles mated readily in small ciga­ found in the rotten Raphia trunks. The fauna retre tins (14 cubic inches in capacity), which of the oil palm trash and of the standing rotten were partly filled with moist rotten palm fiber. trunks was, with one exception, identical. The The eggs of these scaritids were found in the me­ exception was Oryctes sjiistedti, which was only dium, there being one egg per beetle. In a single found breeding in the oil palms. However, it instance a second egg was laid 3 days after the seems safe to regard this siteas a sort of elevated first had been discovered. The eggs were oval trash heap rather than an unique environment. in shape, about 2 mm long and Y2 mm wide. At Umudike the beetles were kept in round, When laid they were sticky, and quickly became 50-cigarerre-size tins. At .first only one adult covered with bits of frass. This made them hard was put in each tin, but later, to conserve space, to find and, as no special arrempts were made to two were placed in each container. Rotten palm discover them, no doubt many were missed. fibre was added to each tin to give the beetles Adult female beetles which were dissected con­ something in which to dig. After about 1,400 tained a maximum of four large eggs. specimens had been collected at Umudike, they Both the adults and larvae of N . savagei were taken to Ibadan and there packed for ship­ readily attacked;"killed, and consumed cetonid, ment. Plywood trays divided by partitions into Oryctes, and other dynastid grubs of a size up 2-inch cubes were used to hold the beetles in to 10 g in weight (the size of an early third transit. Each cube was partly filled with moist instar Oryctes larva). The larvae of the palm wood wool. A single scaritid was placed in each weevil, Rhynchophorus phoenicis F., were of­ compartment, and the tray was covered with fered to the adult beetles and while these were yg-inch-mesh wire screen held down with usually killed, the beetles did not seem to feed staples. Three or more trays were then packed on them to any extent. into a heavy polythene bag to prevent loss of The adult scaritids survived for long periods moisture. The trays in their bags were packed without food, the maximum period noted being into heavy cardboard boxes which were wrapped about 4 weeks. with paper. From 4 to 6 boxes made up a ship­ The adult beetles are winged and are strong ment. The insects were sent from the Ikeja air­ fliers. Occasionally they are attracted to lights POrt via Paris to Fiji by air freight. Cigarette tins at night. were used as containers for the first two or The sexes are readily distinguishable. The three shipments, but these were heavier than mandibles of the male are elongated, and the the plywood trays. distal portion is without well-developed hori­ During the shipments, there were always zontal teeth. Those of the female are slightly more beetles than containers. Usually, enough broader and shorter, and the left mandible has males were discarded to bring the sex ratio to a broad, flartish, horizontal inner tooth which 1 male to 3 females instead of the normal 1 to 1. forms a subapical notch. The mandibles of the An ideal container would have been an alurni- 446 PACIFIC SCIENCE, Vol. XVII, October 1963 num box of about 8 cubic inches capacity, and compared with specimens of Oryctes m onoceros had these been available in quantity many more from East Afri ca. This was done, and the Ibadan insects could have been sent. species was found to be identical with the East An attempt was made to keep N. saoagei Afri can O. m on oceros. adults together in a large tin, but this was un­ To determine whether the fallen trunks were successful due to cannibalism even when 8 cubic suitable as breeding sites, four sections were inches were allowed per beetle. selected and set upri ght. After these had been At first it was thought desirable to provide in position for about 3 weeks, they were split food for the insects during the tim e they were open. Seven adult beetles of O.
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