lU) A. MATTHEWS. 



thorax, widest near the shoulders, faintly asperate in transverse rows, sides slightly 

 rounded, apex straight; abdomen very long, much attenuated towards the apex, 

 4—5 segments exposed, apex obtuse, rounded ; legs and antennse pale yellow, the 

 latter very short, with the club dusky. 

 California (Crotch). 



TRICHOPTERYGINA. 

 PTI1«EL,L,A. 



Motschulsky, Bull. Mosc. 18 p. 505, 1,S45. 



Body elongate, slender. 



Head large, prominent, often long ; eyes often wanting in % . 



AntenN/E generally long and slender, each joint ornamented with long 



setae, 11 -jointed, 1-2 very large, 3-8 long and slender, 9-11 incrassate, 



forming an elegant moniliform club. 

 Pronotum small, transverse, generally more or less constricted towards 



the base. 

 Scutellum triangular. 

 Elytra short, truncate. 

 Abdomen very long, with five or six segments exposed, apical segment 



often dentate. 

 Mesosternum moderate, not carinated. 

 Metasternum large, extending to the sides of the body. 

 Venter composed of six segments. 

 Posterior coxje remote, narrowly laminated. 



Synoptic Table of Species. 



Elytra dilated towards the apex pelliicida. 



Elytra not dilated towards the apex. 



Length more than 1 mm Chainpioiiaiia. 



Length less than 1 mm. 



Thorax not constricted near the base Piili. 



Thorax constricted near the base. 



Elytra shorter than the head and thorax, sculpture faint Quei'CUS. 



Elytra longer than the head and thorax, sculpture deep ilicerta. 



Pt. Oliainitioiiana n. sp. — L. c. 1.12 mm. — Elongate, oval; depressed, 

 shining, translucent yellow, clothed with very short golden hair; head large, 

 pointed in front; eyes small and prominent; thorax shorter, but rather broader 

 than the head, widest at the middle, strongly and abruptly constricted at the base, 

 ornamented with minute remote tubercles with the interstices smooth and shining, 

 and generally with a broad irregular depression on the disk ; sides margined much 

 rounded anteriorly, and abruptly constricted near the base ; basal margin nearh' 

 straight, with the angles acute, and very orominent ; elytra short, much shorter, 

 and not wider than the head and thorax, wider near the middle, moderately as- 

 perate in remote transverse rows, with the interstices smooth and shining, apex 



