30 Bulletin Wisconsin Natural History Society. [Vol. 10, Nos. 1 & 2. 
though Schmiedeknecht (1909) briefly gives its characters, and, 
as it stands today, contains but a single species 2 , the one upon 
which it was founded—( Gastrancistrus) Hypopteromalus ( taba - 
cum) viridescens (Walsh). It was first mentioned in the litera¬ 
ture by Garman (1897), seven years before its description, and 
again by Ashmead (1900), four years prior to that time. As 
pointed out later, this genus has nothing to do with the Miscogas- 
terida. Crawford (1910) refers to two of its characteristics and 
gives a table of the species. 
Host Relations of the Genus. 
Hypopteromalus viridescens (Walsh), representing the genus, 
is a common hyperparasite of the higher Lepidoptera, such as 
Sphingidce and Noctuidw, attacking primarily the microgaster 
genus Apanteles Foerster, issuing as adults from their cocoons. It 
is known to attack Apanteles congregatus (Say) when a primary 
parasite of Phlegethontius,Ceratomia and Heliophila;(Apanteles) 
Microplitis catalpce (Riley) on Ceratomia; Apanteles militaris 
(Walsh) and A. linguitidis (Riley) on Heliophila; and Fitch 
(1865) records it as a secondary parasite of Sphinx kalmice Smith 
and Abbot, the host being a microgasterid; and Dimmock (1898) 
as being secondary on Smerinthus geminatus and Ampelophaga 
myron. I have reared it from what appear to be the cocoons of 
A. smerinthi Riley on a willow leaf. I also record beyond, rearing 
it from Sphecodina abbotii, upon which it is secondary, and from 
the cocoons of Apanteles congregatus (Say) on the larvae of Cera¬ 
tomia catalapce Boisduval. 
Hypopteromalus apantelophagus Crawford is parasitic on 
Glyptapanteles japonicus and H pcecilopus Crawford on Glypta- 
panteles sp. 
Distribution of the Genus. 
The species viridescens is widely distributed in the United 
States, of which it is most probably a native. In the literature, it 
is recorded from the following localities: Illinois (Schuyler 
2) Since this was written Crawford (1910) has described two species from 
Japan and Europe, H. apantelophagus and H. pcecilopus, respectively; 
these are not included here, but both differ from the type species 
in having 1 an elongate first funicle joint. Crawford here and pre¬ 
viously (Idem, 1909) calls attention to its abdominal petiole and 
anomalous tribal position. 
