n 



7V 



146. 

 GASTEROPHILUS SALUTIFERUS. 



Order Diptera. Fam. QEstridae LeacJi. Muscides Lat. 



Type of the Genus CEstrus Equi Clark. 

 Gasterophilus Leach. Gastnis Meig. CEstrus Linn., Fab., Clark. 

 Antenna; approximating, inserted in a cavity in the centre of the 

 face, membranous, 5-jointed, basal joint somewhat cup-shaped, 

 pilose, 2nd very large kidney-shaped, 3 following forming a long 

 awl-shaped naked seta, the basal joint of which is nearly obso- 

 lete, the 2nd quadrate (fig. 3). 

 Labrum, Tongue, Mandibles and Maxillcc none. 

 Palpi? 2, minute, exarticulate, globose, naked, inserted below 

 a small tubercle at the bottom of the head (2 * c, detached and 

 very highly magnified) 

 Lip none. 

 Mouth none or concealed. Head vertical, short and blunt (2 *, a front 

 view showing the situation of the antennce). Eyes lateral, oval, alike 

 in both sexes (a). Ocelli 3, placed close together in a triangle upon 

 the crown of the head (b). Scutellum large. Abdomen with its 

 apex injlexed, very much elongated and attenuated in the female, 

 being terminated by a horny tube (J , abdomen of a female in profile). 

 Wings divaricating, punctured, containing 12 or 13 cells, the costal 

 nerve not surrounding the wing, the posterior margin without trans- 

 verse nervures (9). Squamulse small, not concealing the Halteres. 

 Legs very slender long and hairy. Tibiae simple, very long and 

 slender. Tarsi as long as the tibi(S, 5 -jointed, basal joint the longest. 

 Claws long, simple. Pulvilli large, bilobed, with a strong bristle 

 between them (8, afore leg). 

 Larvae cylindrical, mouth armed with 2 hooks, the segments of the body 

 furnished with a double row of short spines ; living in the stomachs 

 of herbivorous animals. 



Salutiferus Clark's Supp. to an Essay on the Bots. 



Female. Black, very pubescent, shining, punctured. Head 

 covered with short ochraceous hair. Eyes dull castaneous. 

 Thorax and scutellum covered with bright ochraceous pu- 

 bescence, rather black at the base of the wings. Abdomen 

 clothed with long straw-coloured pubescence (especially at the 

 base) excepting the 2nd segment on which it is black. Wings 

 slightly fuscous, yellowish brown at the costa and base, costal 

 nervure brown, the others paler. Squamulce opaque-white. 

 Legs reddish brown, clothed with paler pubescence. 

 Male brighter and more robust, the thorax orange, the black 

 spot on the thorax at the base of the wings generally more di- 

 stinct. Abdomen towards the apex orange, legs clothed with 

 brown hairs. 



[n the Cabinets of Mr. Clark and the Author. 



