HOW TO KNOW THE INSEQS 



Figure 2ib. 



Fig. 215. 

 De G. 



Gasterophllus Intentlnalls 



Yellowish brown, thickly covered with 

 hairs, somewhat resembling a honey bee. 

 Wings are mottled and abdomen ringed 

 with brown. Lays Its eggs on legs of 

 horses. Length 12-14 mm. 



There are but three species of this 

 family known In the United States. The 

 larvae attach themselves to the wall 

 of the stomach, throat, nasal passages 

 and Intestines of horses and If present 

 In large numbers greatly reduce the 

 horses' efficiency. 



17b Oral opening large; mouthparts well developed 18 



18a Anal cell (between 5th and 6th 

 veins) present. Fig. 216 19 



Fig. 216. Wing of Trupaneld show- 

 ing anal cell. 



18b Anal eel I absent. 

 Flies.) Fig. 217. 



Figure 216 



Usually devoid of bristles. (The Frit 



Family 60, CHLOROPIDAE 



Fig. 217. Chloroplsca glabra 

 tielgh. 



Head, thorax, legs, scutellum 

 and underparts of abdomen yellow. 

 Eyes, mid-dorsal stripe on head, 

 three stripes on thorax and much 

 of the dorsal surface of abdomen 

 blackish brown, shining. Very 

 common and readily taken by 

 sweeping in grasses. Length 

 about 2.5 mm. 



The Frit Flies are very small, 

 Figure 217. smooth flios. Many of them 



attack the stems of grasses 

 where the larvae develop. Our 

 cereal plants have several rather serious pests in this family. 



19a Wings pictured (with colored design) 20 



19b Wings usually not pictured; antennae bristle long plumose (c) 

 (The Small Fruit Flies). Fig. 218. 



Fami ly 55, DROSOPHILIDAE 



103 



