CLASSIFICATION OF INSECTS. 186 



all the organs of the mouth exceed the antennae 

 in length ; ocelli none ; wings linear, covering 

 the body ; body narrow, linear, elongate ; legs 

 very long. Inhabits woods, &c. entering houses ; 

 feeds on the blood of man and quadrupeds. 

 Culex, Anopheles, Chironomus, Tanypus. 



668. Moth gnats {Psychodites). Larva in- 

 habits and feeds on putrescent fungi, &c. Pupa 

 changes in the same situation. Imago with 

 antennae filiform, and perfectly simple, alike in 

 both sexes ; ligula short, entire, somewhat 

 pointed ; wings deflexed, very hairy, enveloping 

 the body laterally, and their inner margins uniting 

 above it. Psychoda. 



669. Bald-headed flies (C?/r<i7e«). Larva and 

 pupa unknown. Imago with antennae seven- 

 jointed, entirely concealed, so that the head ap- 

 pears perfectly globular ; the basal joint is short 

 and small, the second stout, and the remaining 

 five united into one, which is very acute at the 

 apex, and somewhat incrassated at the base : 

 ligula, a slender tube ; ocelli three ; wings longer 

 than the body, but too narrow to cover it ; alulae 

 large ; prothorax and body very globose. Inhabit 

 white thorn, furze, rushes ; very seldom fly, and 

 appear exceedingly sluggish. The body is so soft 

 as to indent on the slightest pressure. Ilenops, 

 Acrocera. 



670. Unicorn flies {Bomhiliites). Larva and 

 pupa inhabit the earth. Imago with antennae 



