4^- 



FA MILY XII . T RI CHOPTER YGIDJE 



segments, three of which are exposed above ■ prosternuni produced 

 behind into a long, broad plate, bifid at apex ; mesosternuni strongly 

 carinate. produced into a broad, spoon-shaped process which covers 

 the hind coxa?. 



037 (2935). Lt-MVlodes paradoxa Matthews, Aim. Lye. Nat. Hist.. N. ¥., 

 VIII. 1867, 409. 



Conic, widest in front, very convex. Reddish-yellow, shining, thickly 

 Clothed with a silky grayish pubescence. Thorax very large and convex, 

 widest at base, sides circularly rounded in front, hind angles acute and 

 slightly produced: surface alntaceous. Elytra shorter and narrower than 

 head and thorax, surface very finely and prettily grannlate. Length 1 mm. 



Clark County; scarce. May 5. Three specimens from ants' 

 nests beneath flat stones. Occurs throughout the United States. 



Pteryx bruniieo Lee chestnut-brown, thorax with sides widest 

 at the base, length .9 mm., and P. balteata Lee. bright yellow, tho- 

 rax with sides slightly rounded and widest before the base, length 

 .6 mm., may occur in southern Indiana. 



Ptinellodgs lecontei Matth., elongate-oblong, yellow, translucent, 

 length 1 mm., may also occur. 



IV. Tmchopteryx Kirby. 1819. (Gr.. ''feather -wing.") 



A large genus of small oblong or ovate species, having the anten- 

 na- 11-jointed. the last three joints forming a bead-like club: head 

 large, rather deflexed ; elytra truncate, usually short : abdomen with 

 six ventral segments ; hind coxa? moderately distinct, the outer edge 

 expanded into a broad plate. Of the 30 or more species known 

 from North America but two have as yet been taken in the State, 

 though several others doubtless occur. 



KEY TO IXDIAXA SPECIES OF TRICHOPTERYX. 



a. Thorax distinctly wider than elytra. 



7). Thorax smooth : elytra not attenuate ; color dark chestnut brown, 



shining: length .9 mm. geabricoleis. 



IjTj. Thorax with small, rather remote tubercles or granules. 



c. Head and thorax black, the latter dilated : elytra dark chestnut 



brown: form elongate-oblong. 938. haldemaxxi. 

 cc. Entirely black but thickly clothed with long reddish hair: thorax 



widest before the base : length .9 mm. abretta. 

 aa. Thorax scarcely or not at all wider than elytra. 

 d. Hind angles acute, often produced. 



e. Head, thorax and abdomen black, elytra dark reddish-brown : 



length .9 mm. parallela. 

 ee. Entirely black or fuscous black. 



f . Elytra widest at apex : length .8 mm. aspera. 



