muir: two new species of ascodipteron. 353 



Dated. The male, at least in this species, remains external, his 

 proboscis not having the necessary weapons to cut through the skin 

 of the bat. 



Most of the bats were caught in the Batoe Lobang, a cave situated 

 in the hills, a few miles southwest of the town of Amboina, which 

 in the rainy season is flooded with from six to twenty inches of water. 

 In my breeding cage one of the fine full-grown larvae fell into some 

 water and pupated floating on the surface. It is therefore possible 

 that some of the larvae ejected while the cave is flooded may escape 

 destruction. 



I have named this species after Dr. Paul Speiser, the well-known 

 authority on the Pupipara, to whom I am indebted for the identifica- 

 tion of the Streblidae and Nycteribiidae mentioned in this paper. 



The imbedded female. The presence of the parasite makes itself 

 visible as a small swelling at the base of the ear of the bat, with a 

 small pearly-white body protruding from one side (Plate 1, fig. 1). 

 Viewed under a lens of medium power the exposed end is seen to have 

 an opening running horizontally across the top; this is the vagina or 

 opening of the large uterus. The insect has the power of extruding 

 or withdrawing the edges of this opening. When fully extruded a 

 small dark spot, the opening of the rectum, is visible dorsad of the 

 vagina. A little above this are four spiracles, the inner pair nearer 

 the anus than the other; a pair of dark spots bearing short bristles 

 lie between the inner spiracles and the anus. Ventrad of the vagina 

 is another pair of spiracles. A row of small dark bristles circle the 

 vagina in line with the spiracles, several irregular circles of similar 

 bristles are situated a little further forward. 



Dissected out of its host the parasite appears as a semitranslucent, 

 pearly white, flask-shaped body (Plate 1, fig. 2) from four to five milli- 

 meters long and two to three across the largest diameter; the shape 

 and size varying according to the stage of development of the larva 

 in the uterus. No head or thorax is visible, but the anterior end is in- 

 vaginated to form a chamber in which they are situated (Plate 1, fig. 2). 

 Under a lens of high power the abdomen appears annulated, owing 

 to the presence of circular body muscles just below the skin; below 

 these circular muscles is a layer of longitudinal muscles, attached to 

 the central part and proceeding to both ends, of the abdomen. Simi- 

 lar muscles, but less numerous and highly developed, are situated in 

 the abdomen of Nycteribosca ambuinensis. 



The uterus is large and when containing a full grown larva extends 

 more than half-way up the abdomen. There is a pair of large, short 



