TENEBRIONID.E 89 



just before the scutellum a short transverse fold; elytra with sculp- 

 ture nearly as in aiiatlonwsis, except that the ridges are much 

 higher and with finer summits, the more concave interspaces strongly, 

 irregularly punctured, shining, the humeri slightly everted and 

 prominent but not exposed basally; abdomen rather strongly and 

 closely but not very coarsely punctate (cf), or finely, sparsely so 

 (9). Length 10.0-12.2 mm.; width 4.1-5.8 mm. Arizona (Win- 

 slow), H. F. Wickham sigillata n. sp. 



Body small and rather slender (cf ), strongly convex, deep black, densely 

 coated with earthy matter, the pale hairs nearly as in the preceding 

 but not quite so long; head feebly impressed and punctulate, dull, 

 the antennae moderately slender, the third joint notably longer than 

 the fourth; prothorax but little wider than long, widest rather 

 behind the middle, where the sides are somewhat prominently, 

 almost subangularly rounded, thence converging to base and apex, 

 becoming very feebly sinuate near each, the apex only moderately 

 sinuate, with the angles not much advanced and somewhat blunt; 

 base feebly arcuato-truncate, becoming slightly but broadly sinuate 

 at each side; surface nearly as in sigillata, the fold before the scu- 

 tellum finer; elytra sculptured as in sigillata, the first and second 

 ridges confluent near apical third but differing in outline, being more 

 regularly oval, widest nearer the middle and more acute posteriorly; 

 punctures between the suture and first ridge very coarse and deep; 

 abdomen rather strongly but only moderately closely punctate; 

 external apical spine of the anterior tibiae exceptionally small and 

 slender. Length 9.7 mm.; width 4.25 mm. New Mexico. 



obtecta n. sp. 



The male and female differ considerably in this genus, the former 

 being notably more slender and with the greatest width of the both 

 more posterior than in the latter, at least in several species. The 

 punctuation of the abdomen is usually much stronger and closer 

 medially in the male than in the female, where the punctures are 

 not only finer but sparser and more evenly distributed; this is 

 particularly evident in exoleta, where the abdominal punctures are 

 conspicuously strong and close-set medially in the male. The 

 sculpture of the upper surface is apt to be more pronounced in the 

 male, and there are slight differences, as usual, in the relative sizes 

 and proportions of the anterior parts and the hind body. The singu- 

 lar short transverse fold of the pronotal surface, situated along the 

 base just before the scutellum, is a generic character but is poorly 

 defined except in sigillata and obtecta. 



Pycnonotida n. gen. 



In this genus the body is stout and very convex, without closely 

 adherent earthy matter, the pronotum gibbose, with a discally 



