98 CEKAMBYCID^E. 



punctate, the narrow interstices minutely punctulate ; faintly 

 pubescent ; each with a short sutural spine at the apex, fur- 

 nished with two feeble dorsal costae and a short faint lateral 

 one. Prosternum gradually sloping in front of the coxae, trans- 

 versely rugulose, its front margin slightly raised, the intercoxal 

 process very narrow. Tarsi slender, the first joint in the hind 

 tarsus nearly as long as the rest united ; the cleft of the third 

 extending to the base. 



Length 15-20^ ; breadth 4-5% mm. 



Hob. Assam : North Khasi Hills {Godwin-Austen). Japan : 

 Tsu Shima. 



This species enters into Sharp's genus CepJialallus, and possibly 

 may not be really distinct from C. oberthuri, Sharp, the type of that 

 genus, as it apparently differs only in colour, as the latter is 

 described as piceous with the elytra ferruginous. Cephalallus, 

 Ceplialocrius and Megasemum are distinguishable by such slight 

 structural characters that I consider them at most as only sub- 

 genera of Criocephalus. 



Group GEMINI. 



Head vertical or subvertical in front ; the clypeus as a rule 

 very short ; gula without mentigerous process ; ligula corneous ; 

 eyes deeply emarginate, sometimes completely divided ; antennae 

 much longer than the body in the <$ . Prothorax sometimes 

 tuberculate or spined at the sides, but more often unarmed. 

 Elytra generally long. Front coxaB more or less prominent, their 

 acetabula angulated on the outer side and open posteriorly ; the 

 intercoxal process narrow arid not dilated at the end. Acetabula 

 of the middle coxae extending to the epimera. Wings with vein 

 Cu 2 absent, and Cu 1 either simple or bifurcated towards the 

 end. Stridulatory area of mesonotum usually large and well 

 developed and, except in one genus, not divided by a median line. 



Synopsis of the Genera. 



A. Front coxae contiguous. 



a. Prothorax not wider in middle than 



at each end; third antennal joint 

 shorter than fourth or any of the 

 succeeding joints AMIMES, p. 99. 



b. Prothorax wider in middle than at 



each end ; third antennal joint not 

 shorter than fourth or succeeding 

 joints. 



a. Eyes completely divided ; prothorax 



without lobe at base TETRAOMMATUS, p. 100. 



b. Eyes emarginate; prothorax with 



median lobe at base HYPOESCHRUS, p. 104. 



