312 DAVENPORT ACADEMY OF NATtJRAl. SCIESTCES. 



pieces/ of which the tergal or dorsal is strongly bent downward at the 

 sides, forming a deep groove on the underside throughout its entire 

 length, and which for a short distance near the base is formed into a 

 complete sliealh by the meeting of its sides. The sternal piece is rather 

 flattened and lies within this groove, or sheath. 



Internal Organs.— The nervous system I have not studied. A large 

 apparently three lobed ganglion, is often plainly seen in the head in 

 specimens which have been rendered somewhat transparent. It is evi- 

 dent from his actions that the male is well supplied with nerves and 

 very sensitive to them. 



The rnusdes are numerous and well developed, especially in the tho- 

 rax, but I have not studied them- 



The digestive organs are apparently very abortive. There appears to 

 be no opening for a mouth, and I have been able to discover no anus, 

 neither any indications of stomach, nor intestines. There is however a 

 small pair of malpighian vessels similar to those of the larva The male 

 appears to subsist entirely upon food cells stored up during the early 

 part of the pupa state. 



The respiratory organs I have likewise not studied. The larger trach- 

 eal vessels and the spiracles I have not observed, but I suppose the 

 latter are situated on the sides below the wings. Small tracheal vessels 

 are seen to extend into the limbs, and one passes along by the side of 

 the main vein of the wing. 



Two rather large glands (tig. io,i.) situated in the eighth abdominal 

 segment, furnish the material forming the long waxy anal filaments, 

 (fig. 45,/, /^) and are the only secretory organs I have observed. 



The anterior portions of the generative organs, (fig. 45) including prob- 

 ably the testes, lie within the thorax and have not been studied by me, 

 but in the anterior part of the abdomen are two large vessels (a, a') filled 

 and distended with the filamentary spermatozoa. These vessels extend 

 backw^ard about as far as to the sixth segment, becoming gradually nar- 

 rowed into slender tubes (6, b^). They then take a turn outward and 

 forward and then again inward and slightly backward, until they 

 come together and unite to form the ductus ejaculatorius (c). This last is 

 composed of thick cellular or muscular walls, transversely striated, is 

 enlarged towards the middle, then becomes smaller again as it ap- 

 proaches the penis {d, e] into which it extends and discharges itself. I 

 have an impression of having seen, under pressure, this or some other 

 organ protruded from the tip of the penis. 



The spermatozoa (fig. 46 and 46a) after passing out of the ductus ejaculato- 

 rius and penis appear usually more or less closely united in bundles. Fig. 

 46 shows a small detached bundle, to the structure of which Dr. Mark has 

 called my attention. One end of each spermatozoon is sharply pointed 

 and more highly refracting than the other end, thus giving it an arrow- 

 head-like appearance. The specimen figured is found on one of my 

 preparations, and has been preserved for over two years in glycerine. 

 In fresh preparations in glycerine or acetic acid, there is no appearance 



