THE CANADIAN ENTO^IOLOGIST 



characters, at least in variabilis, are subject to great variation. A recent 

 examination of the types and of the series both at the Gipsy Moth Parasite 

 Laboratory and at the United States National Museum by the writer 

 brings out two points, i.e., that the species are abundantly distinct and 

 that the pollinosity on the third segment of the abdomen in variabilis 

 varies all the way from the typical condition to the condition met with in 

 \y\i\ç.2\flûridensis. The following conspicuous structural differences will 

 serve to separate the species : — 



T variabilis Coq. T. fioridensis Tn. 



1. Third joint of antennae 3.5 to 4 i. Third joint of antennce 2 to 2.5 



times length of 2nd. times length of 2nd. 



2. Costal spine very inconspicuous. 2. Costal spine strongly developed 



and very conspicuous. 

 (To be continued.) 



NOTES ON THE PARASITIC HYMENOPTERA. 



BY A. A. GIRAULT, BRISBANE, AUSTRALIA. 



Superfamily Chalcidoidea. 



Family Encyrtidc^. 



Subfamily Encyrtin?e. 



Tribe Arrhenophagini. 



Genus Rhopoideus Howard. 



I. Rhopoideus fuscus, new species. 



Dr. C. Gordon Hewitt, Dominion Entomologist, Ottawa, Canada, 

 has sent me among other things eight specimens of an Encyrtine bearing 

 acute edentate mandibles, which agree well with the genus Rhopoideus 

 Howard. This species, however, has but 9-jointed antennae, counting a 

 very short, almost imperceptible ring-joint; its antennal club is solid. 

 Now Ash mead gives as a diagnostic character of the genus in question 

 lo-jointed antennae (the funicle 5-jointed, no ring-joint mentioned), which 

 would imply at least a 2-jointed antennal club. The original description 

 OÏ Rhopoideus \t2i.vç.s ox)Q. in doubt as to the total number of antennal 

 joints, the only statement made concerning them being to the effect that 

 the funicle is 5-jointed. Nevertheless, this Canadian species agrees so 

 well with the generic description, even to the possible hosts, except in the 

 antennae, that we have reason to question Ashmead's statement concerning 

 the latter. With this species the funicle is 5-jointed, the first three joints 



January. IQ12 



