﻿UNITED STATES AND MEXICAN BOUNDARY. 23 



punctured, and the legs differently colored. In the species last mentioned the sexual 

 characters are as in L. mylabrina, but less strongly developed : the dilated joint 

 of the maxillary palpi is narrowed, slightly trapezoidal, and flattened beneath. 



Lytta t e n e 1 1 a , nigro fusca, undique pube cinerea pruinosa, vix punctulata, capite antennis pedibusque 

 rufo-testaceis, illo linea longitudinal! glabro, thorace latitudine paulo longiore, campanulato, rufo- 

 testaceo, nonnunquarn nigricante. Long. -46. 



Llano Estacado, July 4th, Capt. Pope. Belongs to group B — g, with L. p e n n - 

 sylvanica, maculata, &c, from all of which it differs much by the color. The 

 outer spur of the anterior tibiae is a little broader than the inner one, and obtuse. 



Lytta linearis, elongata nigra, pube cinerea densissiuie vestita thorace latitudine longiore subcam- 

 panulato, labro vix emarginato, antennis articulis 2 et 3 brevibus (hoc tamen longiore) conjunctis 4to 

 vix longioribus. Long. -46. 



One specimen, August 4th, Llano Estacado, Capt. Pope. In form resembles our 

 common L. Fabricii Lee, (cinerea\\ Fabr.), but differs from it and from all others 

 known to me by the proportion of the 2nd and 3rd joints of the antennae. The joints 

 after the 4th are equal in length, moderately closely articulated, slightly diminishing 

 in breadth : the 2nd and 3rd joints together are a little longer than the 4th, and the 

 3rd is a little longer than the 2nd : the first joint is a little longer than the 2nd and 

 3rd together. The spurs of the posterior tibiae are slender and acute. For present 

 convenience this species may be placed in B — g, near L. lemniscata. 



Ly tta c o s t a t a Lee, was also collected by Capt. Pope in considerable numbers, 

 and I am therefore enabled to note on the present occasion the sexual characters. 

 In the male the first articulation of the antennae extends behind the eyes, and is 

 slender ; the 2nd is two-thirds as long as the 1st : the 3rd is double the length of the 

 2nd : the 4th and 5th are similar to the 3rd ; the remaining joints are equal, and 

 individually only one-third the length of the 5th. In the female the 1st and 3rd 

 joints are equal, the 2nd less than two-thirds of the length ; the 4th and 5th are 

 equal to the 2nd, and the following ones about two-thirds the length of the 5th. 



I stated (Proc. 7, 84) that the species might enter group B — g, but the above 

 mentioned sexual characters would seem to indicate the propriety of establishing 

 another group B — g'. for its reception. 



Nemognatba flavicollis, nigra, capite nitido parce punctato, elongato, vertice sublaevi, thorace conico 

 flavo nitido, punctis paucis notato, elytris thorace duplo latioribus, fortiter haud dense punctatis, piceis 

 postice ad suturaua pallidioribus, pube brevi nigra erecta vestitis : mandibulis elongatis, antennis extror- 

 sum sensim incrassatis ; maxillis pallidis corpore duplo brevioribus. Long. -17. 



One specimen, Texas, Mr. Ulke. This species belongs with N. longicollis Lee, 

 to the group named Gnathium by Kirby. It differs from that species both in size, 

 color and sculpture. 



