44 PROCEEDINGS OF THE AMERICAN ACADEMY. 



purplish, the latter color in the male often suffusing the whole; tegmina 

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

 hind femora Savons, infuscated above; bind til »i;i • 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 tin- female, very bluntly rounded at tip, especially in the female, 

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

 with no Bign of median carina. Disk of pronotum about twice .a- i 

 a> broad, the median carina Bbarp throughout, the lateral carina' distinct 

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

 reaching the tip of the abdomen. Hind femora very Blender, reaching 

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

 acuminate. 



Length of body, £ , 3G mm., 9, 48 mm. ; pronotum, g , 5 mm., 9, 

 7 "_'•"> mm. ; tegmina, £ , 2o nun., 9i 36 mm. ; hind femora. 1 20 mm., 

 9 , 26 mm. 



2 £ , i 9 . Smithville, N. C, Nov. 22. 



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

 trata, which I have not seen, but differs from it as it does from -'/. alacris 

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

 M. neomexicana, 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. ACENTETIS AM) TTS SpECIKS. 



Thisgenus was founded by McNeill (Proc. Dav. Acad. Nat. So.. VI. 225) 

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

 a single male without antenna', taken in Colorado. I have a Bingle 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 gensB are nar- 

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

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

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

 the name unicolor. The antenna', the description of which had of course 

 to he omitted from the generic characters, are depressed Bubfiliform, not 



