354 bulletin: museum of comparative zoology. 



ovarian tubes, opening into the uterus by a very short oviduct. When 

 the uterus is empty the ovarian tubes point anteriorly, but as the 

 larva develops the uterus pushes forward and carries the base of the 

 ovarian tubes with it so that the ovarian tubes eventually point 

 posteriorly (Plate 1, fig. 2, o). Muscles proceed from near the middle 

 of the external walls of the uterus to the abdominal wall, and together 

 with the longitudinal abdominal muscles, regulate the movements 

 of the uterus for ejecting the full grown larva. 



A pair of small glands, 1 spermathecae ? (Plate 1, fig. 2, spr.), open at 

 the base of the oviduct and below these, in a central position, is the 

 short common duct of the two sets of nutriment glands (Plate 1, fig. 2, 

 ng). A set of these glands lie on each side of the body, each set con- 

 sisting of three ducts with small, round, glandular cells, situated 

 symmetrically along each side. The three ducts meet in a common 

 duct before joining the opposite set of glands to form the common 

 opening. These glands reach to the anterior walls of the abdomen 

 and then turn back. Cyclopodia albertisi and Nyctcribosca amboinen- 

 sis show a similar condition except that the glandular cells are bunched 

 together at the end of the nutriment ducts. In all the specimens of 

 Pupipara that I have examined one of the ovarian tubes is always small 

 and apparently not functional. The nutriment glands appear to be 

 modified colleterial glands. 



This form of female genital organs is common to the Pupipara and 

 several species of viviparous Muscidae (sens, lot.) i. e. the genus Glos- 

 sina, Dyscritomyia hawaiiensis and several Malayan species I have not 

 yet identified. Among the Tachinidae some of the oviparous and 

 viviparous species have greatly enlarged uteri, but, so far as I know, 

 none have the pair of simple ovarian tubes. Dyscritomyia hawaiiensis 

 carries the young larva about in the uterus for many days before 

 depositing it, but the larva does not appear to increase in size while 

 in the uterus. 2 



The stomach, beyond the thorax, is long and thick, the intestine 

 long and thin, slightly enlarged in the rectum. There are two Mal- 

 pighian tubes (one pair) joined together and entering the intestine 

 by a common stalk. I can trace no "rectal glands." Both Cyclo- 

 podia albertisi and Nyctcribosca amboinensis have two pair of Mal- 

 pighian tubes and four "rectal glands." 



The abdominal tracheae just behind the spiracles are large, but 

 soon break up into smaller tubes. Those leading from the ventral 



1 Only one is shown in the figure. 



2 1 am indebted to Mr. F. Terry for information about this species. 



