CLASSIFICATION OF INSECTS. 185 



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 (Cyrtites). 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. Henops, 

 Acrocera. 



670. Unicorn flies (Bombiliites). Larva and 

 pupa inhabit the earth. Imago with antennas 



