35 



DESCRIPTION OF A FOURTH NEW SPECIES OF TRICHOPTERYX, TAKEN 

 BY MESSRS. CROTCH IN THE CANARY ISLANDS. 



BT THE EET. A. MATTHEWS, M.A. 



When my former paper on the discoveries of the Messrs. Crotch 

 was published, I had reserved a few specimens of this family for further 

 examination, and among these have found three examples of a species 

 differing from any known form in so many essential characters, that I 

 feel no hesitation in describing it as new. 



From its deep black colour, unusual in the group to which it 

 belongs, I have named this species " anthracina.''' The other differential 

 characters are mentioned at the end of the following description. 



Trichoptertx antheacina, n. s. 



L. c. vix 1^ lin. Sub-ovate, convex, deep black, very shiniug, spai'ingly 

 clothed with grey hair ; head large, somewhat prominent, tliorax con- 

 vex, dilated posteriorly, covered with rather large tubercles arranged in 

 sinuated rows, with the interstices alutaceous and shining, the posterior 

 angles much produced ; elytra narrower than the thorax, much attenu- 

 ated posteriorly, especially in the male ; antennae pitchy-black, legs 

 bright yellow. 



Head very large, rather prominent, covered with tubercles in trans- 

 verse rows ; eyes large and prominent ; antennae rather short, 

 pitchy-black. 



Thorax very convex, much dilated posteriorly, with the sides slightly 

 rounded and strongly margined, covered with large tubercles in 

 sinuated rows, with the interstices alutaceous and shining, the 

 posterior margin slightly depressed, and sinuated, with the extreme 

 edge yellow, and the angles much produced. 



Scutellum moderate, triangular, elongate, faintly asperate. 



Elytra convex, much attenuated posteriorly, especially in the male, 

 narrower than the thorax, and rather longer than the head and 

 thorax united, with the sides almost straight ; moderately asperate 

 in remote, curved, transverse rows, apex slightly rounded, narrowly 

 pale, with the extreme edge white ; the posterior part of the suture 

 slightly elevated. 



Abdomen moderately exposed. 



Legs moderate, bright yellow. 



Under-parts black, with the abdomen paler : mouth, coxae, and apex of 

 the metasternum bright yellow. 



