96 SOME INSECTS INJURIOUS TO TRUCK CROPS. 
when more material of both sexes was obtained they were seen to 
be different. Mr. Coquillett states that some individuals have the 
bristles practically as in eepetorum, but in the males the median 
black stripe of the abdomen is continuous. This material corresponds 
so well with Stein's description of Chortophila planipalpis as to 
leave no reasonable doubt of the species. The type locality is Idaho. 
The insect will therefore be known as Pegomya planipalpis Stein, 
and may be called the western radish maggot. Another lot of the 
maggot was received from the same source October 1, larvae and 
pupae both being present. From this lot adults issued November 
1 to 21. 
November 21, 1908, we received from Mr. Charles Heise, Aber- 
deen, Wash., a section of turnip mined by larvae which are probably 
of this species, as also a number of puparia. Our correspondent 
stated that his observations showed that the maggot works on onions 
as well as on turnips. As we do not know to the contrary, and do 
not know positively of the occurrence of any onion maggot in that 
State, this surmise may be correct. It remains to be verified or dis- 
proves The seed-corn maggot (Pegomya fusciceps Zett.) occurs 
in that region and is more apt to be the onion-feeding species. 
Two natural enemies of this radish maggot have come under ob- 
servation and have been identified by Mr. J. C. Crawford, as follows : 
Aphtvreta sp. — September 3, 1908, many braconids of a species of 
the genus Aphcereta emerged from material in which this root- 
maggot was breeding in infested radish from San Francisco, Cal. 
It is a small species, shining black in color, with dusky wings and 
yellow legs. In some specimens there are 21 joints to the antennae 
on one side and 22 on the other. It is very similar to the type of 
muscce, but is larger. 
Polypeza sp. — This species was reared from its host October 10, 
1907, and appears to be undescribed. 
NOTES ON WATER-CRESS INSECTS. 
The water-cress leaf -beetle. — May 2, 1907, Mr. J. W. Bryan brought 
to this office from Halltown, W. Va., specimens of the water-cress 
leaf-beetle (Phcedon aeruginosa Suffr.), present in the beetle and 
larval forms, the larvae at that time about half grown. The beetles 
were beginning to die and a fungus attack was noticed when received. 
Numerous individuals of the beetle and one larva were parasitized by 
the fungus. The fungus was tentatively determined by Mr. Haven 
Metcalf, Bureau of Plant Industry, as Entomophthora splicer osperma. 
If this identification is correct, there can be no doubt that the fungus 
attacked the insect before death, and may therefore be a factor of 
value in its natural destruction. 
« Berl. Ent. Zeitschr., Vol. XLII, pp. 234-235, 1897. 
