HENRY J. FRANKLIN. 261 



Distinctive Characters of the Subgenus. 



Females and males (figs. E and F) with ocelli small, 

 placed near the supra-orbital line and above the narrowest 

 part of the vertex, the two lateral ones about as far from the 

 margins of the eyes as from each other ; fore wings with 

 transverse median vein (fig. 3) forming an obtuse inner angle 

 with the median and tending to coalesce at its base for a 

 short distance with base of discoidal vein ; hind wing (fig. 

 4) with transverse median vein nearly straight, forming a 

 strongly acute inner angle with the median and a strongly 

 obtuse inner angle with the anal vein. 



Eyes of male not noticeably swollen ; vertex broad, not 

 depressed ; malar space at least as long as its width at 

 the apex ; third antennal segment usually shorter than fifth ; 

 genitalia with volsellae usually extending but little beyond 

 the tips of the squamae (some species of the Dicmoucheli 

 group are marked exceptions in this respect). 



The apices of the hind metatarsi of the females usually 

 drawn out into a more prominent projection, behind the in- 

 sertion of the second tarsal segment, than in the subgenus 

 Bombias (the species of the Terrestris group are notable ex- 

 ceptions), but into a less prominent projection than in 

 Psithyriis. 



The five following New World groups are placed in this 

 subgenus : Terrestris, Borealis, Kirbyellus, Pratorum and Du- 

 moucheli. 



THE TERRESTRIS GROUP. 



"The group of B. terrestris'' Radoszkowski, Bull. Soc. 

 natural. Moscow, xlix, P. 1, 1884, p. 80. 



Type. — Bonibus terrestris Linnaeus. 



Characters of the Group. 

 Females. — Head broad and rounded in outline ; malar space 

 short ; mandibles strongly four-toothed ; hypopygium with- 

 out median carina ; genital guides toothed ; the posterior 

 margins of the hind metatarsi unusually arcuate and their 

 apices, behind the insertion of the second tarsal segment, not 

 drawn out into so prominent a projection as in most of the 

 species of the subgenus Bonibus. 



TRANS. AM. ENT. SOC, XXXVIII. 



