THE ENTOMOLOGIST 



Vol. XXXIL] AUGUST, 1899. [No. 435. 



NOTES ON AQUATIC KHYNCHOTA.— No. 3. 

 By G. W. Kirkaldy. 



1. Corixa melanog aster, n. sp. 



Belongs to subgenus Basileocorixa, Kirkaldy ; allied to C. 

 selecta, Fieber. 



Pronotum, clavus, and corium feebly rastrate. Pronotum with 

 obtuse lateral angles, membrane not distinctly separated from corium. 

 Intermediate tibiae one-fourth longer than tarsi, which are one-seventh 

 longer than the claws ; metaxyphus long, isosceles triangular, sub- 

 acute. 



<y. Frontal fovea suboval, rather shallow, extending to about 

 one-third of the length of the eyes (as seen below), two small fovea) 

 posterior to the base. Anterior tibiae somewhat dilated apically, palre 

 long, narrow, cultrate (length four times as great as width at base), 

 with about thirty- six small rounded blunt teeth extending from base 

 to apex. Strigil rather large, almost square, about eight rows of teeth 

 (the five basal, regular and parallel ; the three apical, somewhat 

 broken). Length 8 mill., breadth 3 mill. 



Costa Bica, Alajueta (coll. Montandon). 



Dark olive-brown. Pronotum with 11-12 rather irregular yellow 

 lines ; yellow lines dilated and entire at base of clavus, undulated and 

 interrupted at apex ; undulated and subentire at base of corium ; abbre- 

 viated and contortuplicated on membrane and apex of corium. Corium 

 not divided by regular longitudinal dark lines. Metauotum bluish 

 black. Dorsum of abdomen black, segments 2 and 3 more or less 

 reddish, connexivum and apex of last segment pale. Apical segment 

 of posterior tarsi blackish. Venter entirely black, except the exterior 

 lateral margins of pleura, legs, apex of metaxyphus, &c. 



This species, of which I have only seen the male sex, is 

 separable from all the other Americans of the "selecta" group 

 known to me, by the form of the palse. 



ENTOM. AUGUST, 1899. T 



