NORTH AMERICAN COLEOPTERA. 153 



and the male sexual characters prove its distinctness. By its antennal 

 structure it should be associated with xmiti, but that species is entirely 

 brown and of much more robust form. 

 Occurs in southwestern Texas. 



C). f'allax n. sp. — Form elongate, rufo-testaceous, head, thorax and broad post- 

 median elytral band pieeous. Antennae pale brown, joints 2-10 very nearly 

 equal, eleventh longer. Head coarsely and densely punctured, subopaque, sparsely 

 pubescent. Thorax subcylindrical, slightly narrower at base, twice as long as 

 wide at apex, very slightly contracted behind the apex, a little more so in front 

 of base, surface coarsely punctured, the punctures coarser than on the head but 

 less dense, basal marginal groove distinct, ante-scutellar impression feeble, surface 

 sparsely pubescent. Elytra elongate oval, gradually wider from the humeri which 

 are not prominent, surface with rows of very coarse moderately closely placed 

 punctures which become gradually finer posteriorly but do not quite reach the 

 apex, intervals very narrow with a row of distant fine punctures, sparsely pubes-. 

 cent. Body beneath rufo-testaceous, moderately densely finely punctate. Legs 

 yellowish testaceous. Wings abortive. Length .32-. 46 inch; 8-11.5 mm. 



ilia/e.— Fifth ventral deeply semi-circularly emarginate, sixth ventral elongate, 

 parallel, the sides arcuate at tip, the apex deeply quadrangularly emarginate; 

 last dorsal narrower than the ventral, elongate oval, truncate at tip and with a 

 slight notch at middle. 



Female.- — Last ventral short, semi-circular, smaller than the last dorsal which ia 

 more elongate oval and prolonged. 



The elytra have a little variation in color. The post-median fascia is 

 always present, and usually broad with irregi^lar edges. Rarely there 

 is a trace of a fascia at basal fourth and another in front of the apex. 

 This species might be supposed to be a variety of undulata, but the 

 elytra are much narrower at base, more oval, and but a small trace of 

 wings remains. The sexual characters are of the type of ovipennis and 

 augustata. From these last two species fallax differs in its more elon- 

 gate elytra with stronger sculpture and with the head and thorax much 

 more densely punctate. 



Occurs in southwestern Texas. 



From my memory merely, Jullnx resembles very closely Mr. Gorham's 

 determination of angvsttita. That author after having placed augustata, 

 ovipennis and pilosclla in synonymy makes the following remarks : '' The 

 difficulty of determining the species of this genus is so great that I doubt 

 the correctness of the synonymy given above, as adopted by American 

 describers" (Biol. Cent. Am. iii, pt. 2, p. 138). That there is difficulty 

 I admit, but it is to be regretted that some little attention was not given 

 to many characters indicated by me (Trans. Am. Ent. Soc. v, p. 221), 

 of which all mention is omitted in the Biologia. Regardine' the synonymy, 



TRANS. AMER. KNT. SOC. XII. (24) MARCH, 1886. 



