12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



subapically; mesothorax and scutelliim moderately shininjr (not 

 polished), closely and distinctly punctured, the median line of 

 mesothorax not evidently impressed, and no line on scutellum; upper 

 part of mesopleura shining; area of nietathorax with strong plicae,, 

 not reaching apex, the latter not sharply defined ; posterior trunca- 

 tion with median sulcus very strong; tegulae rufous, dark at base; 

 wings strongly dusky (dilute fuliginous), stigma and nervures 

 dusky testaceous; basal nervure rather near to nervulus; second 

 cubital cell conspicuously narrowed above, receiving recurrent ner- 

 vure near its end; legs black, with white hair; abdomen very 

 broad, shining (dull at base of second segment), hind margins of 

 segments not reddened; very narroAv white hair bands on lateral 

 hind margins of segments 2 and J5; much pale hair at apex. 



Low Lighthouse, Siberia, July ti, 3 females (Cockerell). 



Type.— C'dt No. 27350, U.S.N.M. 



The following notes will assist in the separation of the above 



species : 



H. transpositua has the punctures of mesothorax much larger than in H, 

 tutihen^i^. 



H. suirrafulgens is easily separated from //. trichorhinus- by the shining meso- 

 thorax and lines between punctures on front. 



H. brachycephalus is easily known from H. perplcxamt, variety speculinus, by 

 the sides of mesothorax rough and sculptured between punctures. 



H. perplexans is readily known from II. xulcattiliis by the hind margins of seg- 

 ments 1 to 4 with dense fringe of white plumose hairs laterally. H. sulca- 

 tulus has the punctures of mesothorax weaker than in perplexans. 



The impressed lines on scutellum readily separate H. sulcatulus from H. per- 

 plexans, H. trichorliinus, and H. hrachycephalus. 



H. transpositus and H. tutihensis are noteworthy for the remoteness of the 

 basal nervure from the nervulus. 



H. HuprafuUjem differs from all the others by the broad white bands at bases 

 of segments 2 to 4. 



o 



