328 Mr. T. D. A. CockereW^Descriptions and 



Various species ascribed to Bomhus have been described from 

 the OHgoceiie and Miocene of Europe, but they require 

 reinvestigation. Buttel-Reepen (Mitt. Zool. Mus. Berlin, 

 1906, p. 163) has given a scheme of evolution of the 

 Bombidse &c. differing somewhat from the above. He was 

 not, of course, acquainted with the numerous new amber 

 genera, and he took too seriously some of the generic refer- 

 ences of the older authors. 



Andrena hypolitha^ sp. n. 



? . — Length about 10 mm. 



Head broader than long (width of head 2g mm., breadth 

 between eyes in middle of face about 1700 fJb) ; head and 

 thorax black ; legs ferruginous, tibiae and tarsi hairy, claws 

 bifid. Length of anterior wing not over 6 mm. ; nervures 

 and stigma pale ferruginous. Abdomen oval, about 5^ ram. 

 long and slightly over 3^ broad (no doubt broadened some- 

 what by flattening) ; colour of abdomen light ferruginous, 

 with four broad dark ferruginous bands, the first very broadly 

 interrupted, the margins of the bands are suffused and 

 ill-defined. 



Stigma large; lower section of basal nervure straight 

 except at its lower end, which is abrui)tly bent; second s.m. 

 receiving first r. n. beyond the middle; first discoidal cell 

 very long and narrow, possibly a little narrower than normal 

 by distortion ; third t.-c. with a strong double curve ; end of 

 marginal cell obliterated, but its probable total length less 

 than 1700 (m. Transverso-raedial of hind wings almost 

 vertical, the lower end a little more basad. 



The following measurements of the anterior wing are 

 in fj,: — 



Second submarginal cell on marginal 238 



Third „ „ „ 272 



Depth of marginal cell 340 



(at 850 fj. beyond end of stigma it is 204) 



Length of stigma 850 



(stigma on marginal cell 391) 



Depth of stigma 221 



Length of first submarginal cell (obliquely) 935 



„ „ „ „ on first discoidal (not 

 allowing for gentle double curve) 800 



modern insect-genera are older than the Miocene ; hence if Bombus 

 already existed it would probably be in the Old World, and CalyptajAs 

 would represent an earlier type segregated in America, to be exterminated 

 later by the invasion of Bumhiis. 



