220 CLASSIFICATION OF INSECTS. 



Imago with antenmB seven -jointed, entirely concealed, so 

 that the head appears 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 ; alulce large ; prothorax and body very globose. 

 Inhabit white-thorn, furze, rushes &c. ; very seldom fly, and 

 appear exceedingly sluggish. The body is so soft as to 

 indent on the slightest pressure. Hetiops, Acrocera. 



Unicorn fliies or Bomhyliites. Larva and pupa inhabit 

 the earth ; the latter has the back much arched, the front 

 and underside of the head armed with strong spines ; the 

 abdominal segments furnished at the sides with long curved 

 set(B, dorsally with transverse series of strong hooks ; the 

 leg-cases extend considerably beyond the wing-cases, and 

 the case which encloses the proboscis lies between the legs ; 

 the extremity of the body is also sjDined. Imago with an- 

 tenncB composed of seven joints ; the basal and second 

 joint short; the apical portion long, linear 

 and consisting of five united joints, of 

 which the terminal one is acute ; ligula, 

 very long rigid and porrected like a horn ; 

 ocelli three ; wings widely divaricating, 

 narrow, variegated ; alulce small ; legs 

 uiiicoin Fly. loug, slcuder ; body short, globose, very 



hairy. Inhabits lanes and woods, hovering over flowers, 

 &c. Bombylius. 



Gad-flies or Tabanites. Larva inhabits the earth ; is 

 elongate, cylindrical ; head corneous, linear, elongate, and 

 furnished with two hooks. Pupa changes in the earth ; 

 has two tubercles anteriorly, and six sharp points near the 

 ])osterior extremity. Imago with antennas composed of 

 seven joints, the basal joint long and rather stout, the 



