101 
species is the most frequent and doubtless the most beneficial of all the 
carabids, although we also find the larvae of H. caliginosus Fabr. quite 
common in grub-infested fields. 
An interesting observation on the predaceous habits of these larvae 
was made by Mr. H. E. Smith at Wellington, Kan., April 4, 1913. A 
carabid larva picked up behind the plow and placed with a Phyllophaga 
grub immediately attacked it, piercing the skin with its mandibles but 
not tearing it, making only a small opening through which the body 
fluids were obtained. The grub thus attacked died in about three hours, 
after most of the body fluids had been consumed. The carabid died 
before maturing. 
The carabid adults, commonly termed ground-beetles, have been 
frequently observed feeding on adult May-beetles. Mr. C. M. Packard 
saw an adult Calosoma calidum Fabr. in the act of attacking a live May- 
beetle at Hagerstown, Md., April 21, 1914. The beetle worked its head 
beneath the elytron of its prey and bit into the soft part of the abdomen, 
a method usually practiced by these insects. Mr. Packard observed at 
the same time a Harpalus caliginosus eating the remains of a dead 
Phyllophaga, there being no proof, however, that it was responsible for 
the death of the beetle. Mr. W. L. Taliferrio saw at College Park, Md., 
May 8, 1893, a C. calidum feeding on the viscera of a live Phyllophaga 
adult through a hole in the abdomen, and the writer has made similar 
observations at Lafayette, Ind. We have also seen Calosoma scrutator 
Fabr. eating a live May-beetle beneath an electric light. Dr. Forbes 
(25) mentions finding a carabid beetle (Chlaenius tomentosus Say) 
clinging to a Phyllophaga beetle and feeding upon its viscera, partly 
drawn out of the wound, and Dr. Riley (60) saw Calosoma lugubre 
attacking May-beetles beneath street lights. 
An interesting parasite of Harpalus pennsylvanicus (?) larvae was 
found by the writer at Mendon, Mich., September 11, 1916. In the field, 
which was being plowed, carabid larvae and adult H.. pennsylvanicus 
(Schwarz det.) were exceedingly numerous, and two larvae were found 
parasitized by a hymenopteron. Both were rigid, as though attacked 
by an Isaria fungus, and to one the naked pupa of the parasite was 
attached. The other showed the parasite larva just issuing. The larva 
when mature, issues from the anal end of the host, and, remaining 
attached, it pupates as illustrated (Pl. XV, Fig. 61). The adult of this 
parasite was not obtained. 
MiscEtLannous INSECTS SOMETIMES PREDATORY 
Dr. Forbes (26) records an observation made by E. G. Kelly, who 
found three yellow coarctate meloid larvae with the remains of white- 
grubs attached, the natural supposition being that they had been feeding 
on the grubs; and this is quite probable since it is a well-known fact 
that meloid larvae, the immature stages of the destructive blister-beetles, 
feed on grasshoppers’ eggs and the immature forms of certain other 
insects. 
