276 MEMOIRS ON THE COLEOPTERA 



Ophistomis texana n. sp. Form and ornamentation as in sexnotata, 

 but with finer and closer thoracic sculpture, the elytral punctures also 

 somewhat less coarse; head nearly similar; antennae rather more slender 

 and elongate and not deep black but always pale in color throughout, 

 not infuscate or stouter distally as they are in montana, the poriferous 

 spaces of the last four joints (cf ) oval, only slightly elongate, deep and 

 sharply defined, minute on the preceding joint, or ( 9 ) very much smaller, 

 deep though less acutely defined; prothorax longer than wide, closely, 

 moderately strongly sculptured and immaculate; elytra as in sexnotata, 

 the sutural angle at apex being wholly obliterated, the sutural edge 

 evenly rounding outwardly to the very acute tip; male with the terminal 

 impression of the slender pale last ventral deep and large, rounded; legs 

 very slender. Length to tips of elytra (cf 9 ) 10.0-12.0 mm. ; width 2.5- 

 3.0 mm. Texas (locality unrecorded). 



In the male of sexnotata, the terminal impression of the last ventral 

 is much smaller and feebler and the poriferous spaces of the outer 

 antennal joints are longer, being a little less than half as long as the 

 joints, very shallow and not so sharply denned as in texana. The 

 elytral maculation is sharply denned and deep black in the female, 

 but is faded out more or less in the male, a character not noted in 

 sexnotata or the following: 



Ophistomis evanescens n. sp. Nearly similar to the preceding in 

 sculpture and coloration but rather more slender, the prothorax, es- 

 pecially, being narrower and much longer than wide, differing particu- 

 larly in the antennae, which have the first five joints dusky testaceous, 

 sparsely and inconspicuously pubescent, the remainder abruptly pale 

 flavate throughout and with the short vestiture coarse, dense, very pale 

 and notably different and also differing in having the fifth male ventral 

 less elongate, more convex and with the terminal impression almost 

 completely obsolete; elytral markings deep black in the male and as in 

 sexnotata, the acute apices also as in that species and texana; legs pale 

 throughout as in texana and not bicolored as they are in sexnotata; tarsi 

 piceous-black distally. Length (c/ 1 ) 9-5 mm.; width 2.4 mm. Texas 

 (Harris Co.). 



In the male of texana the last dorsal segment is a little wider and 

 has the sides feebly arcuate, while in evanescens this segment, though 

 similarly pale in color, has the sides feebly converging and straight; 

 in both, there is a very small supplementary segment behind the 

 segment referred to, which in texana is more strongly rounded at 

 tip than in evanescens. 



The three following species are allied to luteicornis, having the 

 elytral apices obliquely truncate and with evident sutural angles 

 but without the swollen male abdominal apex of virilis andfamelica: 



