494 CASEY 



the head but not quite as wide, widest near the apex, where the 

 sides are strongly rounded to the ver}- briefly tubulate and trun- 

 cate apex, gradually converging to the broadly arcuate base, which 

 is much wider than the apex, the sides prominent at the bulbiform 

 ends of the sulcus, the surface longitudinally plicate except toward 

 the sides, where it becomes sparsely and simply punctate ; elytra 

 at least one-half longer than the anterior parts, more than two 

 and one-half times as long as wide and fully three-fourths wider 

 than the prothorax, circularly emarginate at base, the sides feebly 

 arcuate, gradually and feebly converging from before the middle 

 to the rapidly and obtusely rounded apex, broadly rounding at 

 base to the humeral angles, which are not rounded and somewhat 

 exposed, the surface flat above, rather abruptly almost vertical at 

 the sides, broadly, flatly and feebly elevated at each side of the 

 suture, these flat surfaces each with an even medial series of fine 

 . punctures, the general surface with coarse and elongate, moder- 

 ately close punctures, becoming gradually finer posteriorly ; ab- 

 domen feebly convex, finely, sparsely punctate medially, coarsely 

 and closely toward the sides and on the last two segments. Length 

 3.9-4.3 mm.; width 0.9-0.95 mm. Arizona (Tugson), — H. 

 F. Wickham striaticeps Lee. 



This species occurs under stones in hot dry places, from 

 southern California to southeastern Arizona, and, according to 

 Dr. Horn, feigns death very persistently when disturbed ; it is 

 probably more for this reason that it is seldom taken, than 

 because of its actual rarity. The elytral punctures are con- 

 fused, but form also two feebly defined irregular discal series, 

 evanescent posteriorly on each elytron. 



Tribe Typhlusechini. 



A singularl}'^ isolated minute species necessitates another 

 special tribal group under the above name. The large convex 

 clypeus, broadly sinuate at tip and concealing all the mouth 

 parts from above, and the convex abdomen, with large and un- 

 modified fifth segment and strongl}'- sinuate third suture, cer- 

 tainly indicate an alliance with the Ara^oschizini, but the antenna^ 

 are wholly different, and the reception of the antenna? in long 

 deep cephalic grooves ending in the anterior part of the pro- 

 pleurae, is a character wholly without parallel in the subfamily. 

 The type species approaches the completely blind condition 

 more closely than any other Tenebrionid that can be called to 

 mind at present. The genus may be described as follows: — 



