TEE IIEHSIAN-FLY. 



357 



the larva state. They 

 may be recognized as 

 _greeiiish maggots living 

 among groups of plant- 

 lice. 



In the two-winged gall- 

 flies (Pig. 345, Cecidoviyia 

 destructor Say, or Hes- 

 sian-fly) the body is small 

 and slender, with long 

 antennae. The crane-flies 

 {Tipula) are large flies, 

 •standing near the head 

 of the order, and, like 

 the gall - fly, the chry- 

 -salis has free appeiid- 

 -ages, there being n o 

 puparium or pupa-case, 

 -as in the lower flies. 

 Lastly, we have the mos- 

 quito (Figs. 346 and 347), 

 whose larva is aquatic, 

 -and breathes by a process 

 on tlie end of the body, 

 ■containing a trachea. 



Order 15. Lepidaptera. 

 — The butterflies and 

 motlis form a well-defined 

 rgroup, and are known by 

 their scaly bodies (Fig. 

 •348), the spiral maxillae or 

 tongue, rolled up between 

 the two large labial palpi, 

 ■and their usually broad 

 wings. As the butterfly, 

 the type of the ordei', has 

 been described at some 

 length, we will only 

 -enumerate some of the 



Fig. 345. — Hessian-fly. a, larva; 6, pupa; 

 c. incision in wheat stalk for larva. (Mag- 

 nified).— After Fiteh. 



Fig. 346. — A, larva; c, its respiratory tube. 

 B, pupa; d, respiratory tube; a, two paddies 

 at the end of the bodj-. 



Fig. 347.— Head and mouth parts of mos- 

 quito, e, eye; a, antennae; Zbr, labrum; 7t, 

 hypopharynx; m, mandibles; vix, maxillag; 

 mxp, maxillary palpus; Ih, labium; c, cly- 

 peas. (Magnified.) 



