536 My. T. D. A. Cockerell — Descriptions and 



western subspecies of M. generosa, Cresson, described from 

 North Carolina and Georgia. M. pruinosa, Friese (a pre- 

 occupied name), agrees very well with chomis, and must be 

 regarded as a synonym. The females resembling cleomis 

 may be separated as follows : — 



Only the last two abdominal segments, seen 



from above, with black hair at sides . . lippice (Ckll.). 



Abdominal segments I'-G, seen from above, 

 with black hair at sides J. 



1. Last abdominal segment above without de- 



pressed whitish hair, but with much 

 black hair; mesothorax shining, punc- 

 tures well separated (from a paratype, 



collected in New Jersey) addemla, Cresson, 



Last abdominal segment above with de- 

 pressed whitish hair 2. 



2. Hair of mesothorax except at sides, and of 



scutellum except behind, black generosa, Cresson. 



Hair of thorax above pale, with black inter- 

 mixed (jenerosa cleomis (Ckll.). 



Megachile parallela, Smith. 



A specimen which I examined in the British Museum, 

 supposed to be parallela, had the hair of vertex and disc of 

 mesothorax dark brown. I now believe it is not genuine 

 parallela, of which Smith says that the hair on disc of thorax 

 is slightly ochraceous. Smith's description seems to be 

 accurate, as it agrees very well with M . facunda, Cresson, 

 which is no doubt a synonym. M. sexdentata, Hob., also 

 appears to be the same species. On the other hand, the 

 female of parallela is not pruina, Smith, but is correctly 

 described by Robertson under sexdentata. The males of this 

 species are very variable in size and the colour of the 

 pubescence, which may be greyish white or strongly ochra- 

 ceous. The female is known by the fine, pruinose, pallid 

 tomentum on the last dorsal abdominal segment, and the 

 joints of the middle tarsi greatly produced and ciliated at 

 their apical corners. 



Megachile rufolobata^ sp. n. 



^ . — Length about 14 mm. 



Robust, with parallel-sided abdomen ; black, with the 

 fifth and sixth abdominal segments bright ferruginous red ; 

 face covered with shining golden hair, but all the other pale 

 hair clear white; vertex, a large discal patch on mesothorax, 

 and anterior part of scutellum with fuscous hair : mandibles 

 broad, black, with two strong apical teeth and a long very 



