4 INSECUTOR INSCITh^i MCNSTRUUS 



Male genitalia. Side pieces conical, about three times as 

 long as wide, excavated at base ; subapical lobe indistinctly di- 

 vided, the outer portion with a group of about hcven fattened 

 setse, the inner portion with three rods. Harpes thin, mem- 

 branous, spinose at tip but without a basal arm ; unci divided, 

 first plate triangular, concave ; second plate club-shaped, ter- 

 minating in many denticles ; third plate long and strap-shaped. 



Larva. Head broad and subquadrate ; antennae with a tuft 

 at the outer third of the joint, the part beyond slender ; head 

 hairs in threes, of equal length. Skin of the body spicular. 

 Lateral comb of the eighth segment of many smyll scales in a 

 patch three rows deep. Air-tube about twice as long as wide, 

 curved on the posterior margin; pecten of about 12 teeth, run- 

 ning nearly the full length of the tube, the last three teeth very 

 stout; hair tufts in about six jmirs, crowded togerher posterior- 

 ly and also localized longitudinally forming a tuft, the hairs as 

 long as the tube and extending beyond it. Anal segment ringed 

 i>y the plate. 



Cotypes, No. 2](i4G, LT. S. Nat. Mus.. two n^ales and three 

 females, bred from larvse found in a water barrel, in a very 

 dirty puddle and in a tree-hole; Compagnie des Mines d'or, 

 Lawa River, Dutch Guiana (Mrs. J. Bonne-Wepster), March, 

 1917. 



This species belongs to Ciilcx proper, the second plate of the 

 male genitalia being formed as in C. corniger Theob. and C. 

 dtipUcator D. & K., with which it should be placed. From 

 corniger, it dififers in the structure of the lobe of the side piece, 

 and agrees with duplicator; but from the latter it dififers in 

 coloration, being a plainly colored form without any white 

 markings. Our correspondent, in transmitting the material, 

 identifies the species doubtfully as C. palus Theob.. which, in- 

 deed, it might be as far as the coloration is concerned. How- 

 ever, we lave identified paltts with similis, etc. (Dyar, Tns. 

 Ins. Menstr., vi. 95, 1918). which dififers in the form of the 

 scales on the mesonotum. 



