NOV., 'o6] ENTOMOLOGICAL NEWS. 345 



spine which curves outwards at its point. Ninth segment strongly 

 curved downwards; the dorsal tuft of two pairs of very long double 

 setae rather widely separated ; a little lateral to these a single long stout 

 spine arises from a prominent tubercle on each side. Ventral tuft of 

 four pairs of long simple setae arising close together. Anal gills 

 four, fleshy, equal,, shortly subconical with rounded apices. Between the 

 ventral tuft and the lower pair of anal gills there is a small lateral 

 prominence on each side bearing four blade-like plates serrated along 

 their anterior borders with a number of progressively larger recurved 

 serrations, and with two much longer pointed processes near their 

 bases. 



Note on the pupa. — Pale purple in color; thorax and abdomen in the 

 same straight line; floating vertically when at rest at the surface of 

 the water. Each pointed process on the terminal segment has two short 

 spines at the apex, one-half the length of the other; there is another 

 short spine on the outer border at the apical third. Penultimate seg- 

 ment with one small lateral hair; antepenultimate segment with four 

 short lateral hairs on each side. Lateral margin serrate, devoid of a 

 fringe. 



Type No. 9960, U. S. N. M. 



Notes on the habits. — A few larvae were found in a hollow 

 tree in Kingston, Jamaica, about the middle of May, 1906. No 

 young larvae were found. The water was brown and thick, 

 and contained numerous minute crustaceans, upon which they 

 feed. Observed in a breeding jar they only occasionally came 

 to the surface and then lay horizontally like anopheline larvae. 

 Usually they remained at the bottom and displayed marked 

 activity, the head and anterior part of the body being now and 

 then rapidly jerked from side to side in their efforts to capture 

 crustaceans. No visible movements, creating currents such as 

 are seen in many culicid larvae in the organs surrounding the 

 mouth, were noticed. The hinder part of the body was ap- 

 parently kept anchored by the appendages on the terminal 

 segment. The larvae were often seen to suspend themselves by 

 these appendages to the side of the jar. When disturbed they 

 wriggled with quick lateral movements in a backward direc- 

 tion ; this appeared to be their normal method of progression. 

 They differ from the larvae of C. brakeleyi in the different shape 

 of the head and arrangement of setae and in the absence of the 

 chitinous plates on the seventh and eighth segments. The 

 pupa stage lasted about three weeks. 



