834 



AN INTROD UCTION TO ENTOMOLOGY 



The larvae that are known Hve in earth or under the bark of rotten 

 trees and feed upon the larvas of other insects. 



Family CCENOMYIID^ 



The members of this family differ from the Stratiomyiidas in that 

 the branches of radius are not crowded together near the costal 

 border of the wing (Fig. 1070) and in the possession of 

 tibial spurs; and they differ from all other Anomalous 

 Brachycera in that the scutellum is armed with two spinous 

 protuberances. The eyes are pubescent ; the flagellum of 

 the antenna consists of eight closely consolidated seg- 

 ments (Fig. 1071); veins M3 and Cui anastomose for a 

 considerable distance; and the tips of veins Cu2 and 2nd 

 A are narrowly separated or, rarely, united for a short 

 distance. 



This family is represented in our fauna by a single 

 species, CcEuoniyia ferrugtnea. This is a large thick- 

 bodied fl}% often measuring 25 mm. in length; but it 

 varies greatly in size. It is of a pale yellowish brown 

 color. 



The larvae are usually found in the ground, but they are 

 ofCceno- sometimes found in decaying wood ; they are predacious, 

 myia. feeding upon insect larvae. 



SUBSERIES B- — THE TRUE BRACHYCERA 



In the families constituting this subseries the antennae are usually 

 three-jointed, but in some cases they are four- or five-jointed; the 

 third segment is not ringed, but usually bears a style or an arista. A 

 similar type of antenna is possessed by the Cyclorrhapa, which were 

 formerly on this account included in the Brachycera; but this term 

 is now restricted to the Short -horned Orthorrapha. 



In the first three families the head and thorax are not furnished 

 with strong bristles and the empodia are pulvilliform. 



Family RHAGIONID^* 

 The Snipe-Flies 



These trim-appearing flies have rather long legs, 

 a cone-shaped abdomen tapering towards the hind 

 end (Fig. 1072) and sometimes a downward-projecting 

 proboscis, which with the form of the body and legs 

 has suggested the name snipe-flies. 



The body is naked or hairy, but it is not clothed 

 with strong bristles. Frequently the hairy covering, 

 though short, is very dense and is of strongly-contrasting 



Fig. 1072.— 

 Chr y s 0- 

 pila tho- 

 racica. 



*This family has been commonly known 

 is the older name and is now coming into use. 



the Leptidce, but Rhagionidae 



