96 SOME INSECTS INJURIOUS TO TRUCK CROPS, 



when more material of l)oth sexes was obtained they were seen to 

 be different. Mr. Coquillett states that some individuals have the 

 bristles practically as in cepetormn^ but in the males the median 

 black stripe of the abdomen is continuous. This material corresponds 

 so well with Stein's description" of t'hortophila planipnlpis 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, larva? and 

 pupa^ both being present. From this lot adults issued November 

 1 to 21. 



November 21, 11)08, Ave 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 clis- 

 proven. 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: 



Aph'ireta sp. — September 3, 1908, many braconids of a species of 

 the genus Aphcvreta 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 antennse 

 on one side and 22 on the other. It is very similar to the type of 

 musccp^ but is larger. 



Polypeza sp. — This species was reared from its host October 10, 

 1907, and appears to be undescribed. 



NOTES ON WATEK-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 aruginosa Suifr.), present in the beetle and 

 larval forms, the larvae at that time about half groAvn. The beetles 

 were beginning to die and a fungus attack was noticed when received. 

 Numerous indiAndunls of the beetle and one larva Averc parasitized by 

 the fungus. The fungus was tentatively determined by Mr. HaA^en 

 Metcalf, Bureau of Plant Industry, as Entomophthora sphrvrosperma. 

 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. P:nt. Zeitsclir., Vol. XLII, pp. 234-2.35, 1897. 



