22 PROCEEDINGS OP THE ACADEMY OP 



late; elytra closely striate punctate, apex rounded, interstices 

 rugiilose; til>ia carinate externallj-, apex not produced. L. .42. 

 Illinois. Very distinctly' the rounded elytra, simple femora, and 

 pubescent thorax. 



D. texana, sp. n. 



Head and thorax narrow, elj'tra rather broad, triangular ; be- 

 neath silvery, above dark-green ; eyes prominent, head sulcate, 

 bituberculate in front ; thorax broader than long, alutaceous, 

 hardly punctulate ; elytra smooth, interstices flat, broad, the rows 

 of punctures golden-green ; legs and antennae aeneous, base of 

 femora pale. L. .40. Texas. 



The only other genus belonging toihis sub-family is Macroplea 

 (Hsemonia), readily recognized by the glabrous testaceous surface, 

 and by its el^'^tra produced into a spine at the apex. The only 

 species is H. Melsheimeri, which lives in rivers clinging to aquatic 

 plants, and may be found throughout the summer. 



OKSODACHNIDES. 



A. Anterior coxal cavities open, thorax with sides dentate. Syneta. 



B. Coxal cavities closed. 



a. Eyes entire. Orsodachna. 



b. Eyes emarginate, thorax with a lateral tubercle. Zeugophora. 



Orsodachna, Latr. 



1. 0. atra (Ahrens), N. Act. Hal., i. 3, p. 26, 27. 



Elongate, thorax coarsely rugosely punctate, with several 

 smooth places in relief; elytra coarsel}', rather closel}' punctate ; 

 beneath finely punctate, and clothed with a short decumbent 

 pubescence. L. .22-.2G. Atlantic region. 



This species is extremely variable, the thorax is black or red, 

 and the elytra are black or ochreous, with the suture and margins 

 black ; the legs are red or black. From these varieties have been 

 formed the hepatica and. vittala of Say, the bwUlata of Lacordaire, 

 the rvficollis and inconstans of Xewman, and the armoiiacae of 

 (iermar. Ahren's name is much older than any of these. 



2. 0. Children!, Kirby, Faun., B. A., p. 221, 298, pi. 7, f. 6, tibialis, Kirby, 1. c. 



Closely allied to the preceding, similarly varial)lc, but smaller, 

 narrower, more shining; thorax sparsely not deeply punctate, 

 elytra less strongly and less coarsely punctate normally, with 



