96 
is cream-colored, elliptical, slightly curved, 1.8 to 1.9 mm. in length by 
.8 mm. in width (Fig. 25, and Pl. IX, Fig. 38). The eggs hatched be- 
tween 1:00 p. m. August 11 and 1:00 p. m. August 12, but none of the 
larvae were reared to maturity. 
AsILus PAROPUS Walk. 
We have reared this species from larvae collected by the writer at 
Montford, Wis., October 3, 1914, in a field heavily infested by white- 
grubs, obtaining from the larvae thus collected 3 adults which issued 
June 9, 12, and 26, 1915, respectively ; also from a larva taken at Lancas- 
ter, Wis., September 27, 1916, which pupated between May 24 and 31, . 
1917, and issued as an adult June 22, 1917. Although the reared speci- 
mens were not noticed feeding on grubs in the field, another specimen, 
supposed to be of the same species, was actually seen attacking a grub. 
This species has also been reared at this station from a larva obtained 
by Mr. A. F. Satterthwait in a grub-infested field at North Lima, Ohio, 
October 27, 1914, the adult in this instance issuing June 14, 1915. Mr. 
H. E. Smith has seen larvae of this species attack grubs in confinement, 
- but, because of their small size, he believes they are more actively pre- 
daceous on smaller larvae, such as Anomala and Macrodactylus. 
_ The life history of A. paropus is unknown, although it probably 
does not vary greatly from that of Promachus. The pupal stage, accord- 
ing to our observations, varies in length from 17 to 28 days, the adult, 
a small, slender fly, issuing in June. 
The species is sparsely but generally distributed in the northern 
United States east of the Mississippi. 
ASILUS LECyTHUS Walk. 
We are not familiar with this species, which resembles A. paropus, 
but Mr. H. E. Smith reports it, in a letter, as predaceous on Phyllophaga 
grubs in confinement. He believes, however, that like A. paropus it is 
more often predaceous on smaller grubs of the genera Anomala and 
Macrodactylus. 
CERATURGUS CRUCIATUS Say 
Our collection records show that the larva of this species occurs 
in fields heavily infested with white-grubs. One larva taken by C. F. 
Turner at Richland, Mich., April 18, 1917, pupated between May 3 and 
10 and issued as an adult June 5, 1917. 
PROCTACANTHUS MILBERTII Macq. 
The larva of this rather common Proctacanthus has not been seen 
attacking white-grubs but has been taken in fields heavily infested with 
them at Richland, Mich., by C. F. Turner, and at New Carlisle, Ind., 
by the writer. At the former place it was found in company with grubs 
of Promachus vertebratus. Our rather meager data indicate that it has 
a two- or three-year cycle, the larva pupating in July (July 13-23 accord- 
ing to our records), and the adults issuing about six weeks later (August 
24 to September 6). 
