BIOLOGICAL PAPERS. 



223 



Derotmema delicatum Scudder. 



Bill Williama Fork, Mohave-Yuma counties, Ariz. ; August, F. H. Snow. 

 One male. 



Mestobregma boreale Saussure. 



Caddoa, Bent county, Cob. ; F. H. Snow. One male. As far as can be made 

 out from the meager original description, this specimen represents Saus- 

 sure's boreale. It is separated from plattei by the superiorly constricted 

 frontal costa. 



Trepidulus rosaceus McNeill. 



Bill Williams Fork, Mohave-Yuma countiep, Ariz. ; August, F. H. Snow. 

 One female. 



Conozoa sulcif rons Scudder ? 



Bill Williams Fork, Mohave-Yuma counties, Ariz.; August, F. H. Snow. 

 Two females. 



Trimerotropis salina McNeill ? 



Clark county, Kan., 1962 ft.; June, F. H. Snow. One male. 



Trimerotropis saxatilis McNeill. 



Caddoa, Bent county, Colo. ; F. H. Snow. One male. 



Trimerotropis snowi, n. sp. 



Type: female. Congress Junction, Yavapai county, Ariz.; July, F. H. Snow. 

 Collection University of Kansas. Allied to T. melanoptera McNeill, but 

 with the vertex slightly narrower, the eye slightly shorter, the basal and 

 median dark bands of the tegmina more distinctly composed of spots, the 

 yellow of the wings more extensive and the fuscous band narrower. Some 

 characters would throw this species under Fl of McNeill's table, but it 

 agrees with nothing in that section, and is no doubt close to melanoptera, 

 paratypes of which have been compared with snowi. 

 Size large; form somewhat robust. Interspace between the eyes equal to the 

 transverse diameter of the eye ; scutellum of the vertex slightly broader 

 than long, shallow, median and lateral carina distinct but low, the former 

 not distinguishable on the occiput; lateral foveola? rather small, sublanceo- 

 late, shallow ; frontal costa subequal for the greater part with a slight con- 

 striction above the ocellus, moderately sulcate, failing to reach the clypeus 

 by a considerable distance; eye not prominent, very distinctly shorter than 

 the infraocular portion of the genas; antennae slender, elongate, exceeding 

 the head and pronotum by half the length of the latter. Pronotum con- 

 siderably expanded posteriorly, metazona about one and three-fourihs the 

 length of the prozona; anterior margin subtruncate, posterior margin rec- 

 tangulate with the angle rounded; median carina low and weak; prozona 

 with several transverse rugce, metazona subgranulose; lateral lobes sub- 

 equal in width, the anterior margin slightly arcuate, postero-inferior angle 

 rounded. Tegmina long and rather broad, apex obliquely truncate; the 

 costal field wide; intercalary vein for its whole length closer to the median 

 than to the ulnar vein, though somewhat approaching the latter proxi- 

 mately. Wings moderately long, rather broad, slightly more than half 

 again as long as broad. Posterior femora comparatively slender, not ex- 

 ceeding the apex of the abdomen. 

 General color vinaceous buff, becoming vinaceous on the head and pleura. 

 Lower part of head and face hoary; eyes burnt sienna; antennae black- 

 ish brown. Pronotum with several whitish, longitudinal bars on the lat- 

 eral lobes and a number of small blackish points on the disk of the 



