NO. 1708. STUDIES OF XORTU AMERICAN WEEVILS— PIERCE. 335 



ately emarginate at base, with humeri only slightly produced, and somewhat 



*cut6 longior LeConte. 



Prothorax wider than long, strongly narrowed on sides at apex with elevated 

 apical ridge; humeral angles more or less prominent, produced. 

 Humeral angles very prominently produced to at least basal fourth of protho- 

 rax; elytra in outline sinuate from tip of humeri; seta) brown and white 



suberect humeralis Say {rectus LeConte). 



Humeral angles only slightly produced forward. 



Elytra only slightly more than twice as long as prothorax, sides slightly 

 convex; humeral angles very short; setse dark and white, more or less 



prominent maculosus, new species. 



Elytra at least two and a half times as long as prothorax, sides subparallel; 

 humeral angles twice as long as in preceding species; setse dark and 



white, erect albidus, new species. 



Elytra not two and a half times as long as prothorax, sides convex ; humeral 

 angles moderate, generally covering basal angles of prothorax; setse 

 dark and white affinis LeConte (riidis LeConte) (crosus LeConte). 



THECESTERNUS FOVEOLATUS, new species. 



Described from a series of seven specimens in the collection of 

 the Southern Field Crop Insect and Tick Investigations, collected 

 by J. D. Mitchell and K. A. Cushman at Marfa, Texas, June 5, 1908. 



Length 8-10 mm. Black, densely clothed with white scales 

 below, and on head; with scaly vestiture above mottled in distinct 

 patterns ; without any clusters of erect black scales on elytra; sparsely 

 clothed with white bristles, which are, however, never prominent. 



Large, robust, outline almost straight from anterior portion of 

 thorax to posterior third of elytra, thence sinuate, apex broadly 

 rounded. Head convex; densely clothed with narrow white scales 

 radiating from center of occiput; punctuation in three series, largest 

 punctures very shallow and ill defined, between these are sharp fine 

 punctures, and finally the entire surface is exceedingly minutely 

 punctulate; front sulcate. Prothorax very large, shghtly wider than 

 long, widest at anterior third, where it is wider than the elytra at 

 the humeri, rather abruptly narrowed in front of this point; base 

 straight, apex arcuate; ocular lobes large, broadly rounded; a broad 

 deep impression starts at the sides near the base, travels forward on 

 the sides, upward at the apex, becomes very deep at sides of disk, 

 just within the widest point and then crosses the disk, arching for- 

 ward ; the punctuation of the thorax has become pitting in tliis species, 

 with the pits irregular, sometimes connected, and the partitions very 

 thin; scaly vestiture very dense in front and at sides. Elytra with 

 humeri very shghtly prominent, more than twice as long as pro- 

 thorax; striate, the first, tliird, and fifth and other alternate inter- 

 spaces wider than the even series, with a double row of small tubercles; 

 striae wider than intervals, pitted with very large quadrate pits, 

 separated by high transverse tubercles, each pit with a distinct 

 round puncture in its center; bristles are borne on these tubercles 



