206 CHIRONOMID^. 



articuli usque ad octavum breviores ; nonus et sequentes longiores. 

 Thorax subovatus, convexus, antice planus. Scutellum parvum. 

 Metathorax brevissimus. Alfe incumbentes. Abdomen cylindri- 

 cum, basi nonnuiiquam contractum. Pedes basi approxiraati ; fe- 

 mora in nonnullis spinosa aut incrassata; tibiae calcaratffi. Mas. 

 Antennae plumoso-barbatse. 



Body small, or very minute, pilose or bare. Head very generally 

 depressed in front, produced into a very short rostrum. Eyes lunate, 

 almost reniform. Proboscis more or less porrect, with fleshy labium, 

 which is rounded in front. Labrum seated on the upper base of the 

 labium, horny, flat, pointed, almost as long as the labium, including 

 the horny and very sharp tongue, which geuerally is also almost as long 

 as the labium, but in some species not more than two-thirds of its 

 length. MaxillcB seated on the under base of the labium, horny, sub- 

 falcate, acuminated, generally as long as the labium. Palpi seated on 

 each side of the base of the labium, four-jointed ; iirst joint cylindrical ; 

 second generally longer, either cylindrical, or oval, or clavate, or ob- 

 clavate ; third and fourth either cylindrical or oval, shorter than the 

 second, or the fourth as long as the second. Antennse porrect, filiform, 

 thirteen-jointed, longer than the head, and in some species almost as 

 long as the body, seated on a thick basis ; first and seven following 

 joints globose or oval, sessile or petiolated ; ninth and four following 

 joints more or less elongated, oval, or elliptical, or cylindrical, beset 

 with short hairs, iind at the base with longer verticillate hairs. Thorax 

 nearly oval, convex, flat in front of the scutellum, which is small. 

 Metathorax very short. Wings parallel with the body in repose, lan- 

 ceolate or oval, pilose or bare ; subcostal vein ending much beyond 

 half the length of the wing ; radial ending towards the tip ; cubital 

 ending by the tip ; subapical simple ; subanal forked ; anal not extend- 

 ing to the border. Abdomen cylindrical, with eight segments, in some 

 species contracted at the base. Legs of almost equal length, approxi- 

 mate at the base ; femora incrassated in some species, armed beneath 

 with spines in many species ; tibiae sometimes slightly incrassated ; 

 joints of the tarsi varying in relative length ; ungues and onychia also 

 varying, and affording specific characters. Male. Antennae beai'ing 

 near the base a thick brush or plume of hairs. Abdomen with forceps 

 at the tip. 



The larvse of some species are terrestrial ; that of C. b'qnmctatus 

 dwells under the bark of dead trees. It is cylindrical, with the 

 segments rather constricted, and the fore part of the body rather 

 thicker ; the head is small and retractile, and each segment of the 

 body has two clavate dorsal setaj. The pupa is shorter than the 

 larva, and much broader in front, witli two short lateral appendages. 

 It is pale yellow, with distinct rudiments of wings and legs, shining, 

 very slightly transparent, beset with bristles on each side, tapering 

 from the head to the tail, which is slender, and as long as the rest 



