INSECTA. 345 



Corethra MEIG. Antennas with fourteen joints in both sexes, 

 with hairs verticillate, very long in male. Wings incumbent. 



Sp. Corethra plumicornis MEIG., Corethra lateralis LATE., PANZEK Deutschl. 

 Ins., Heft 109, No. 16 ; CUVIER R. Ani. ed. ill., Ins. PI. 161, fig. 4 ; the 

 larva lives in fresh water, has forward on the head two curved booklets, 

 and is very voracious ; REAUMUR Ins. v. PI. 6, f. 4 15 ; SLABBER Na- 

 tuurk. Verlustig. Tab. in. iv. ; LYONET, Ouvrage post. PI. 1 7, figs. 14, 

 15, 19- 



Chironomus MEIG., Tanypus ejusd. Wings deflected. Anterior 

 feet remote from the rest, inserted almost beneath the head, very 

 long (at rest porrect). Antennae filiform, with thirteen or fourteen 

 joints in both sexes or in males alone, in females sexarticulate (Chi- 

 ronomus MEIG.) 



Sp. Chironom'us plumoisus, Tipula plumosa L., Cuv. R. Aid. ed. ill., Ins. 

 PI. 1 6 1, fig. 5. The larva is a blood-red worm, often met with in rain 

 reservoirs ; see REAUMUR Ins. V. PI. 5, figs, i 5. On the head are two 

 black eye-spots, and two short antennae consisting of one joint and two 

 threads at the point (these are wanting in REAUMUR'S figure). The head 

 is alternately drawn into and pushed out of the next following joint by the 

 larva. The eggs of Chironomus, oval or navicular and united in strings, 

 were formerly taken for plants (Diatomacece) : Gloinema AGARDH and 

 Echinella ; see the observations of BERKELEY Ann. of Nat. Hist. vn. 1841, 

 pp. 449 451. PL xin. figs. i8; comp. KOELLIKER Observ. de prima 

 Insect, genesi, 1842. 



B. Proboscis porrect, of the length of thorax, or longer than 

 thorax, made up of seven setce. Palps quinquearticulate, porrect. 



Culex L. Antennae porrect, in male plumose, in female pilose. 

 Wings squamate, incumbent. 



JEdes HOFFMANNSEGG. Palps in both sexes very short. 



Sp. ^Edes cinereus HOFFMANN., Cuv. R. Ani. ed. ill., Ins. PI. 161, fig. 3. 



Culex MEIG. Palps of male longer than proboscis, of female 

 short, with first two joints very short. 



Sp. Culex pipiens L., SCHELLENBERG Tab. 41, Cuv. R. Ani. ed. ill, Ins. 

 PI. 1 6 1, fig. I ; everywhere very common, especially in the neighbourhood 

 of turf-diggings, as in the province of Holland. The hum or song adds to 

 the inconvenience. The females alone sting ; the males, known by their 

 plumed anteunee, little or not at all. Another species, with black- spotted 

 wings and white-ringed feet, Culex annulatus FABR., has been often met 

 with by me here in Leyden in winter and in the first days of spring, in 

 mild weather, in dwellings. 



The gnat (Cousin, Schnacke, Milcke) is commonly known. The larvae 

 live in water, and hang on the surface to breathe, with head downwards. 



