NEUROPTEEA STREPSIPTERA. 



565 



Hydropsyche and R/tyacojihila, are fastened to stones. In the walls of these 

 cases there are sand grains, bits of plants and empty snail shells. The larva: 

 have biting mouth parts and filiform trachea! gills on the body segments. They 

 project their horny head and thoracic segments, with their three pairs of legs, 

 from these tubes and crawl about. The pupa leaves the case, which serves also 

 as a pupal skin, and develops into the winged insect out of the water. The per- 

 fect insect resembles the Lcpldoptern in many respects, and lives near water on 

 leaves, and the stems of trees. The female lays her eggs in clumps enclosed in 

 a gelatinous case on stones and leaves near water. Pliryganta striata L. 

 (tig. 4(J9). Mystacidvs quadrifasoiatus Fabr., Hydropxychv variabllis Pict. 



Order 4. Strepsiptera." 



Insects t.oith rudimentary anterior wings rolled up at the points and 

 large hind wings which can be folded longitudinally. The mouth parts 

 are rudimentary. In the female there are neither wings nor legs. The 

 larvcfi are parasitic in the body of Hymenoptera. 



The mouth parts are reduced in the adult sexual animal, and 



FIG. 469. </, Pliryyam <i uti-inta. I, The larva freed from its case (rescue animal). 



consist of two pointed mandibles which overlap one another, and 

 small maxilla:!, which are fused with the lower lip and are provided 

 with two- jointed palps. The prothorax and mesothorax are two very 

 short lings, but the metathorax is unusually elongated, and covers 

 the base of the abdomen, which consists of nine segments. The 

 males possess small rolled-up wing covers, and very large hind wings, 

 which can be folded longitudinally like a fan. The females have 

 no eyes, and remain through life without wings or legs like 

 maggots ; they never leave their pupal skin nor their parasitic 



* W. Kirby, " Strepsiptora, a new order of Insects," Transact. Linn. Soc., 

 Tom X. 



v. oiebold, " Ueber Xenos sphecidarum und dessen Schmarotzer," Beit rage 

 zur Naturgeschichte der wirbellosen Thiere, 1839. 



v. Siebold, " Ueber Strepsiptera." Archiv fiir Naturgesch.. Tom IX., 1843. 



Curtis. "British Entomology," London, 1849. 



