37 
it transformed into the pupa state.” This may be the general rule 
but does not correspond exactly with my observations, for the 
pupae cases were very distinct in my parasitized specimens, from 
which this fly was reared. Mr. Walsh says that “the time for the 
entire transformation of such as I experimented upon from egg to 
fly was from fifteen to nineteen days.” The larvae of these flies are 
as a matter of course, maggots; the pupae resemble rather small 
flattened, mahogany-brown beans with the ends docked. The fol¬ 
lowing description is that originally given by Mr. Walsh, though 
Kirkpatrick had previously named it and given a brief description: 
Nemorcea leucanice, Kirk. 
Syn .—Exorista leucanice, Kirk. Ohio Agl. Rep., 1860, 358. 
Osten-Sackenii, Kirk, 1. c. 
Senometopia militaris, Walsh, 1. c. 
“Length .25 to .40 inch, or from 6 to 10 millimetres, the females 
not exceeding .30 inch. Face silvery, with lateral black hairs only 
on the cheeks, on the top of which is a black bristle. Front-golden 
olive, with a black central stripe and lateral black convergent hairs. 
Occiput dusky. Labium brown, with yellowish hair. Maxipalps, 
rufous. Eyes cinnamon-brown, covered with very short dense 
whitish hair. Antennae, two basal joints, black with black hairs; 
third joint flattened, dusky, and from two and a half to three times 
the length of the second joint; seta, black. The entire hinder part 
of the head covered with dense whitish hair. Thorax glabrous 
bluish gray, lighter at the sides, and with four irregular black 
vittae, and black hairs and bristles. Scutel reddish brown, whitish 
behind, glabrous, with black hairs and bristles. Pectus black, 
glabrous, with hairs and lateral bristles. Legs black, hairy; thighs, 
dark cinereous beneath; pulvilli cinereous. Wings and alulae 
hyaline; nervures, brownish; halterers, opaque greenish white. 
Abdomen, first joint black; second and third opalescent in the mid¬ 
dle with black and gray, and at the sides with rufous and gray; 
last joint rufous, slightly opalescent at base with gray; all with 
black hairs and lateral bristles. Beneath, the first joint is black, 
the others black, margined with rufous, all with black hairs. In 
the male, the space between the eyes at the occiput is one-seventh 
of the transverse diameter of the head ; in the female it is one- 
fourth. The colors of the abdomen sometimes ‘grease’ and fade 
in the dried specimen.” 
The Yellow t -tailed Tachina Fly— (Exorista jlavicauda. Riley.) 
This is another fly similar to and comprised in the same group 
as the former. It is decidedly larger than A r . leucanice , and the 
head is broader than the thorax. The following is Prof. Riley’s 
original description: 
Exorista jlavicauda —Riley: “Length 0.35 to 0.50 inch. Head 
broader than thorax; face silvery white, the cheeks inclining to 
yellow, with lateral black hairs extending to near the base of 
antennae, and one stiffer and longer bristle at the top of cheeks; 
front, dusky, ferruginous, with two rows of black converging bristles, 
divided by a broad depressed stripe of a brighter ferruginous color 
