356 bulletin: museum of comparative zoology. 



one another, does not unite with the corresponding branch on the 

 opposite side; the anterior four appear to unite with those on the 

 opposite side. Small branches ramify among the body muscles and 

 their ends often appear to anastomose. 



The spiracles of the larvae of Pupipara afford good characters by 

 their position, size, etc. 



As little is known about them I describe several. These descriptions 

 refer to the adult larvae taken from the uteri, for in the Nycteribiidae 

 the larvae change their shape immediately they pass out of the uteri. 



The larvae of Lipoptena tolisina Speiser (Plate 2, fig. 6) is oval, 

 about 1.27 mm. long and .72 mm. along the largest diameter, with 

 the posterior end slightly pointed; at the anterior end there is a 

 small constricted portion, across which is an opening leading to the 

 stomach. There are two pair of spiracles, the anterior situated in a 

 dorso-lateral position, about the middle, the posterior near together 

 at the end of the body, standing slightly above the surface. 



The larva of Listropodia sp. nov. (Plate 2, fig. 7) is about 1.27 mm. 

 long and .8 mm. along the largest diameter, ovoid, thicker anteriorly, 

 a small constricted portion indicates the anterior end, with the open- 

 ing into the stomach across the top. The anterior pair of spiracles 

 is situated in a dorso-lateral position, slightly behind the middle line, 

 the posterior pair is situated at the end of the body and does not stand 

 above the surface of the body. 



The larva of Penicillidia progressa Speiser (Plate 2, fig. 8) is about 

 1.6 mm. by 1.2 mm., ovoid, the posterior end being the thicker. The 

 anterior end bears a small head constriction, with the entrance to the 

 stomach. The spiracles are in nearly the same position as Listropo- 

 dia, sp. nov. 



In Cyclopodia albert isi the larva is very similar to that of P. progressa, 

 but. the spiracles, situated in nearly the same position, are very light 

 in color and difficult to see. 



The larva of Nycteribosa amboinensis (Plate 2, fig. 9, a b) is about 

 1.5 mm. by 1.2 mm., an irregular ovoid, distended on the ventral 

 side, sometimes to a great extent, and slightly flattened dorsally; the 

 anterior end is bluntly pointed, but does not bear a constricted head- 

 piece. The anterior spiracles are situated a little less than a third 

 from the end and are far apart; their outline crescent-shaped, the 

 posterior spiracles are near together, on the bluntly pointed posterior 

 extremity, one slightly dorsad of the other, not symmetrically side 

 by side; they stand out from the body wall and their outline is round. 



The position of all these larvae in the uterus is similar, the anterior 

 constricted portion, bearing the mouth, being in contact with the 



