Baring 375 



transverse vestiture not very dense, the slender squamules becoming 

 larger, denser scales at apex; elytra parallel, rounded at apex, four- 

 sevenths longer than wide, about a fourth wider than the prothorax and 

 much more than twice as long, the humeral callus very obtuse, feeble and 

 closely sculptured; striae not very coarse, deep, punctured and subcrenate, 

 the confused interstitial squamules hair-like and not at all dense, more 

 or less oblique at the sides of the closely and strongly punctured intervals; 

 scutellum and two basal thoracic spots as in trinotata; abdomen very 

 densely clothed with broader and elongate-oval white scales, not sparser 

 but less broad medially, where there is a feeble subbasal impression in 

 the male, the usual polished spot at the middle of the third and fourth 

 segments very abruptly defined in both sexes. Length (cf 9 ) 4.0-6.0 

 mm.; width 1.7-2.3 mm. Arizona (Tugson). Seventeen specimens. 



There is much less sexual difference in the pygidium here than in 

 trinotata; in the present species it is a little larger and more trans- 

 verse in the male, with the pale scales confined to a single anterior 

 transverse fascia, while in the female the pale scales are uniformly 

 dense throughout; it is subvertical in both sexes. This species is 

 rather closely allied to mucorea, but is slightly narrower, with more 

 elongate elytra, having deeper striae and more convex intervals, 

 and there is less sexual difference in the beak; the pygidial and 

 abdominal characters are similar, but the scales of the under surface 

 are not so broad as in mucorea, which latter seems to be confined to 

 southern California, the neighboring parts of Arizona, and the 

 upper part of Lower California. The coarsely punctate propleura 

 are almost entirely denuded in both species. 



Trichobaris nanella n. sp. — General characters nearly as in the pre- 

 ceding, but much smaller in size, with shorter beak and distinctly shorter 

 and more compact antennae, black, slightly shining, the legs rufo-piceous; 

 beak less abruptly declivous above at base than in either striatula or 

 mucorea, thick, feebly arcuate and almost as long as the head and pro- 

 thorax in the female; prothorax shorter, fully a fourth wider than long, 

 the sides parallel, rounding for a short distance anteriorly to the apical 

 constriction; sculpture and smooth tumid median line nearly similar, 

 the transverse vestiture very fine, sparse and inconspicuous, the basal 

 spots and scutellum as usual; elytra shorter, less than one-half longer 

 than wide, parallel, more abruptly obtuse at apex, the humeral callus 

 more prominent; striae coarser and less crenulate; intervals only between 

 two and three times as wide as the striae, nearly flat, confusedly punctato- 

 rugulose, the pale hair-like scales still finer and sparser; pygidium similar; 

 abdomen with the squamules slender and much less dense, in fact dis- 

 tinctly separated. Length (9)3-4 mm.; width 1.4 mm. Arizona (near 

 Tugson), — Tucker. One example. 



