360 A Preliminarif Monograph of the 



is feebly arcuate and about four-fifths as wide as the disk; apex feebly 

 arcuate; apical angles slightly obtuse and not at all rounded; basa^l 

 rather broadly so; disk one-fourth wider than long, feebly bi-impressed, 

 finely and densely punctate, the punctures separated by more than 

 their own diameters and becoming confused and slightly scabrous near 

 the sides. Elytra slightly wider than long, nearly one-fourth wider 

 and over one-half longer than the prothorax, finely and rather densely 

 punctate, the punctures about twice as wide as those of the pronotum, 

 and separated by slightly more than their own widths. Abdomen dis- 

 tinctly narrower than the elytra, parallel; sides nearly straight; border 

 rather narrow and deep; surface somewhat finely reticulate, minutely 

 and not very densely punctate; the setae of the terminal fringes are 

 rather long and coarse. Legs moderate. Length 1.7 mm. 



Texas (Austin 2). 



Very easily known by its short, robust form, rather large 

 head, short, flavate antennae and rather larger, more finely 

 granulated eyes. 



37 T. bracliypterus Lee— Thinobius brack. Trans. Am. Ent. 

 Soc, VI., p. 240. 



This very remarkable species is one of the most minute of the 

 genus. It may be known by its very small, feebly convex eyes, 

 long, feebly arcua^te tempora, Very short elytra, and dense, dull 

 integuments. Length, 0.6-0.7 mm. 



38 T. pertenuis n. sp. — Very slender, linear, moderately convex, 

 dark brownish-piceous; elytra pale red-brown; legs and antennae 

 paler, flavo-testaceous; pubescence minute, fine and moderately dense; 

 integuments somewhat shining. Head as wide as the prothorax and 

 about as long as wide, rather convex, minutely and very densely punc- 

 tate; prominences moderate; eyes rather small, feebly convex and not 

 prominent; tempora about three-fourths as long as the eye, broadly 

 rounded and equally prominent; antennae short, rather incrassate, 

 slightly shorter than the head and prothorax; second joint slightly 

 shorter than the next two together and a little more robust, fourth 

 wider than long, tenth distinctly wider than long. Prothorax very 

 slightly wider than long; sides feebly convergent from apex to base 

 and feebly, nearly evenly arcuate; base feebly arcuate, four-fifths as 

 wide as the apex; the latter subtruncate; apical angles right and very 

 narrowly rounded; basal more broadly so; disk with scarcely a trace of 

 impressions, very minutely punctate, the punctures separated by nearly 

 twice their own widths. Elytra distinctly longer than wide, one-third 

 wider and nearly two-thirds longer than the prothorax; sides parallel 

 and straight; disk scarcely perceptibly impressed near the suture, 



