348 



rOKMKIDJ. 



horizontal, the apex sharply truncate and more or less concave. 

 Pedicel 1-jointed, sui'mounted by a scale or Jiode; abdomen more 

 or less oval, Ihe basal segmeiit not forming lialf its length. 



2 • Head and pedicel as in the ^ . Ocelli present. Thorax 

 more massi\ e ; prothorax short, its posterior margiii ai'ched ; 

 posterior lateral angles reaching back to the base of the wings ; 

 mesonotum and scutellum long, raised and gibbous ; metanotum 

 depressed below the level of the scutellum. Abdomen longer and 

 more massive. Fore wing with one marginal and one cubital cell. 



S . Mandibles iiarrower than in the ^ ; antennae 13-jointed ; 

 ocelli and eyes large and prominent. Thorax as in the $ , but 

 more massive in proportion. Node of pedicel thicker ; abdomen 

 proportionately slightly more elongate ; external genitalia very 

 small. 



This widely spread genus has the ^ dimorphous, often pol}'- 

 morphous. In some species the ^ major has a remarkably broad 

 massive head and stronc: mandibles. 



Keij to the Species, 



A. Thorax viewed from side forming a 

 regular arch. 



a. Pubescence on sides of head and 



beneath long, forming a beard 



b. l\ibescence on sides of head and beneath 



short, not forming a beard. 

 a'. Head, thorax and abdomen black. 

 a-. TibifB of the legs prismatic. 



a\ Tibia} without spines beneath . . 

 b'\ Tibias of the legs with spines 

 beneath. 

 (iK Abdomen covered with long 

 recumbent yellowish hair . . 

 IK Abdomen covered with sparse 

 erect hairs. 

 a\ ^ maj. Length 11-16 mm. 

 ^ min. with head poste- 

 riori}' narrow but not con- 

 stricted to form a collar . . 

 b'\ ^ maj. Length 17-21 mm. 

 ^min. with the head poste- 

 riorly constricted so as to 



form a collar 



Tibiaj of the legs compressed but 

 not prismatic. 

 7\ Abdomen with a fine thiu seri- 

 ceous pubescence. 

 «'. Length ^ moj. under 7 mm.; 



pubescence grey 



/>'. Length ^ maj. over 9 mm.: 

 pubescence yellowish 



Ir 



Fig. 108.— Outline thorax: 

 C. compressvs. 



C. harhatus, p. 362. 



C. Inmarcki, p. 365. 

 C. Japonicns. p. 370, 



C. cumpressus, p. 351 . 

 C. an(/usficollis, p. 366. 



C bint/ham!, p. 367. 

 C. pai-ia, p. 364. 



