44 PROCEEDINGS OF THE AMERICAN ACADEMY. 



purplish, the latter color in the male often suffusing the wliole ; tegraina 

 green, the median area, especially near base, more or less ferruginous ; 

 hind femora flavous, infuscated above ; hind tibife dull red. 



Fastigium distinctly longer beyond the narrowest part of the vertex 

 than the extreme breadth, semielliptical, the sides straighter in the male 

 than in the female, very bluntly rounded at tip, especially in the female, 

 the margins scarcely ascending but plane, while the centre is rotundate 

 with no sign of median carina. Disk of pronotum about twice as long 

 as broad, the median carina sharp throughout, the lateral carin^e distinct 

 but not elevated, the posterior margin very broadly rounded. Tegmina 

 7'eaching the tip of the abdomen. Hind femora ver}' slender, reaching 

 the tip of tlie tegmina. Last ventral segment of male short but unusually 

 acuminate. 



Length of body, ^ , 36 mm., 9, 48 mm. ; pronotum, ^ , 5 mm., 9, 

 7.25 mm. ; tegmina, ^, 2o mm., 9) 36 mm. ; hind femora, J* 20 mm., 

 9, 26 mm. 



2 (? , 4 9 . Smithville, N. C, Nov. 22. 



In markings this species seems to bear a close resemblance to M. ros- 

 trata, which I have not seen, but differs from it as it does from M. alacris 

 in the form of the fastigium. It is most closely allied structurally to 

 M. neomexicann, but has a longer pronotum and a more pointed genital 

 segment in the male, while it differs to a considerable decree in color 

 and markings ; these, however, are variable in both species. 



Mermiria rostrata McNeill. 

 This species, known only from Indian Territory, I have not seen. 



2. ACENTETUS AND ITS SpECIES. 



This genus was founded by McNeill (Proc. Dav. Acad. Nat. Sc, VI. 225) 

 on Acentefus unicolor, a species described by him in the same paper from 

 a single male without antennie, taken in Colorado. I have a single male 

 of the same species, taken by me at Lakin, Kansas, on Sept. 1, which 

 agrees with McNeill's figures and description except that the whole upper 

 surface of the head and pronotum is blackish fuscous, the genoe are nar- 

 rowly striped with pale flavous or luteous and pale fuscous, and the 

 lateral lobes have similar luteous stripes on a pale fuscous ground ; the 

 contrast of the dark disk and lighter lateral lobes does not well suit 

 the name unicolor. The anteiinaj, the description of which had of course 

 to be omitted from the generic characters, are depressed subfiliform, not 



