NATUKAL ENEMIES. 51 



StapJiylinus vulpinus Nordm. as probably predatory on the lar^^se. 

 In the spring of 1909 in one instance a ''June-bug" larva (Lachnos- 

 terna sp.) was found by the junior writer feeding upon a larva of the 

 grape root-worm beetle. When first discovered the grape root-worm 

 was already half devoured, and while the operation was being watched 

 the remaining portion was completely eaten. 



The eggs of the grape root- worm are subject to the attacks of a 

 number of different predaceous insects. Professor Webster observed 

 in Ohio a small brown ant {Lasius hrunneus Latr. var. alienus) and 

 three species of mites (TyroglypJius [RMzoglypJius] pliylloxerse [Riley], 

 Heteropus [Pediculoides] ventricosus Newport, and the third, resembling 

 Hoplopliora [PJitMracarus] arctata Riley), feeding upon the eggs. Mr. 

 P. R. Jones, of this Bureau, in 1907, at North East, Pa., found a 

 coccinellid larva (Hippodamia convergens Guer.), and a malacoderm 

 larva (family Telephoridse) feeding upon the eggs of the grape root- 

 worm. The determinations of these coleopterous larvae were made 

 by Mr. E. A. Schwarz, of this Bureau. The junior author in 1909, at 

 North East, Pa., collected a small ant, determined by Mr. Th. Per- 

 gande, of this Bureau, as Cremastogaster lineolata Say, var. ?, which 

 carried off eggs from a cluster on a grape cane. The larvse of a lace- 

 wing fly (Chrysopa sp.) have been observed from time to time extract- 

 ing the egg contents by means of their pointed, tubelike mandibles, 

 which are peculiarly well fitted for the purpose. 



PARASITIC INSECTS. 



Two minute hymenopterous egg parasites, Fidiohia Jlavipes Ashm. 

 and Lathromeris {Brachysticha) fidix (Ashm.), were reared from eggs 

 of the grape root-worm in Ohio by Professor Webster. The late 

 Professor Slingerland recorded Fidiohia jlavipes in the Lake Erie 

 section in 1900, and later, during the present investigation by the 

 Bureau of Entomology at North East, Pa., this minute egg parasite 

 has been constantly noticed by different members of the staff. 

 Lathromeris jidix (Ashm.) has been only once observed at North East, 

 Pa., as recorded on pages 56-57. The two parasites mentioned above 

 were described by the late Dr. William H. Ashmead" in 1894 from 

 specimens reared by Prof. F. M. Webster. The original description 

 of Fidiohia is given herewith: 



Fidiohia Jlavipes sp. n. Female, length, 0.6 mm. Black, polished ; legs and antennae 

 yellow; thorax without distinct furrows, smooth, with only slight indications of furrows 

 posteriorly, but not sharply defined ; wings hyaline, veinless; abdomen oblong, sessile, 

 the first segment wider than long, the second very large, occupying most of the remain- 

 ing surface, the following being usually retracted with it, and thus making the abdomen 

 appear truncated at apex. 



aCinti. Soc. Nat. Hist., vol. 17, 1894, pp. 170-172, 



