BUFFALO SOCIETY OF NATURAL SCIENCES 69 



female but more conspicuous. Metopidium slightly paler with a white 

 margin around the humeral angles and embracing the posthumeral sinus. 

 Face ferruginous brown dotted with paler. Beneath almost black, the tibiae 

 brown and the slender edges of the abdominal segments pale. Length : 

 male 4-5 mm., female 5-6 mm. 



Described from numerous examples taken by me from 

 scrub oak in the Garden of the Gods at Manitou, Colorado, and 

 at Ogden, Utah. The Cornell University collection has a good 

 series from Arizona and Prof. Wickham has sent me both sexes 

 from Cloudcroft, N. Mex. This species like vau varies to a 

 uniform pale brown but the sharp clypeus and sinuated and 

 decurved apex of the pronotum will readily distinguish it. 



13. Cyrtolobus maculifrontis Emmons. 



Very close to vau from which it differs principally by its 

 pale color and the characters of the clypeus. Color pale testa- 

 ceous or almost whitish-yellow. In fully marked examples 

 there is a large blackish patch on the disk of the metopidium 

 which is more frequently reduced to an oval spot on either side 

 or is altogether wanting. The usual markings are here repre- 

 sented by an oblique fuscous vitta well back of the humeral 

 angles, either side of which the surface is a little paler ; post- 

 eriorly the pronotum is tinged with fuscous with the posterior 

 transverse vitta indicated. Usually the dark markings are 

 almost or quite obliterated. The coarse punctures over the 

 whole surface are darker, sometimes almost fuscous in places. 

 In this species the median carina is prominent over to the base 

 of the metopidium and the dorsal line is very regularly arcuated 

 and but little elevated. The face is pale, uneven, and coarsely 

 punctured and the clypeus and lorae are fused ; the former being 

 distinctly transversely convex, its broad angularly rounded 

 apex scarcely breaking the contour of the face. Length about 



6 mm, 



I took a strongly marked female of this species at Manitou, 

 Colorado, and several of both sexes at Atlanta, Georgia, in May. 

 If this determination is correct Emmons' figure is faulty in 

 showing the anterior oblique vitta too transverse. It should be 

 quite strongly angled as represented in pallidifrontis at figure 



7 of the same plate, 



