OCR Text |
Show 1 9 0 2 . ] SPIDERS FROM BORXEO AND SINGAPORE. 2 4 5 models. Xycisie invida (Plate X X III. fig. 26) and X.fumosa ( Plate X X III. fig. 25) are black with the basal half of the elytra reddish; a similarly coloured Lycid model, Melampyrus acutan-gulus (Bourg.) (Plate X X III. fig. 23), is common round Kuching. A. torrida (Pasc.) is brownish-testaceous with a corresponding brownish-testaceous model-Ditoneces sp. (Plate X X III. fig. 29). Of the Astatheinse, Astathes unicolor (Pasc.) (= coccinea Pasc.), a large species with purplish reflections on the elytra (Plate XX. fig- 18), has unmistakable models in similarly coloured Galerucids - Antipha sp. and Ochralea nigripes (Plate XX. fig. 17). The next three species-A. posticalis (Plate XX. fig. 22), A. Jlavi-ventr'is (Pasc.), A. splendida (Plate XX. fig. 20)--all closely resemble each other, being dark shining blue anteriorly, red posteriorly; flaviventris, as its name signifies, has a yellow abdomen, whilst splendida has a red head and prothorax. The latter species mimics an equally resplendent Galerucid- Caritheca mouhoti (Plate X X . fig. 19), and the slight differences between A. flaviventris and A. posticalis are paralleled in two closely-allied Galerucidae- Antiplia abdominalis (Jac.) and A. 1 nigra (Alld.) var. (Plate X X . fig. 21), the former of which alone has a yellow abdomen. A. caloptera (Pasc.), a blue species, finds a model in Haplosonyx albicornis (Wied.) (compare figs. 23 & 24, Plate XX., and see explanation of this Plate for a few further examples given in Table II. but not again mentioned in the text). The remaining genera of the subfamily, as represented in Borneo, have corresponding models, also among the Galerucidae, the resemblance between Ochrocesis evanida (Pasc.) and its model, Hoplasoma unicolor (111.) var. ventralis (Baly), being very exact. All these genera- Tropimetopa, Chreonoma, and Ochrocesis- are unicolorous, and form with the unicolorous Saperdince and numerous1 Galerucidse and Halticidse a large group of similarly coloured beetles, all of which I consider to be distasteful. The subfamily Hippopsince contains four species, each mimetic of a species of the B.hynchophorous family Brenthidte. The first, Alibora sp., mimics Baryrrhynchus dehiscens (Sch.) (compare fig. 3 with 1 & 2, Plate XX.). The general colour of both model and mimic is a rich chestnut-brown, variegated on the elytra with bright yellow streaks and spots; the three basal joints of the antennae of the Longicorn are clothed biramously with long and close-set hairs. In the natural attitude the elongated scapes are closely pressed together, the remaining joints gradually diverging, the result being a remarkable resemblance to the head with its elongated rostrum and shorter antennae of the Brenthid, which only a closer examination proves to be deceptive ; the short legs of the mimic add still further to the resemblance. All the other three species of Hippopsinaz mimic extremely common species of the Brenthid genus Diurus (Plate XX. 1 I have not included in the table all the unicolorous Galerucidae and Halticidae with which I am acquainted ; those that are included are merely typical examples. |