27D THE CANADIAN ENTOMOLOGIST. 



Table of Genera. 



i . Males 2 - 



Females. 



Wingless. 



Antennae 26-jointed ; ocelli wanting (£ un- 

 known (t) Sclerogibba, Stefani. 



(Type S. crassifemorata, Stef.) 



2. Front wings with a closed marginal cell without discoidal cells ; 



antennae 23-jointed ( ? unknown).. (2) Probethylus, Ashmead, g. nov. 



(Type P. Schwarzi, Ashmead, MS.) 

 Tribe II. — Bethylini. 

 The antennae are 12- or 13-jointed, alike in both sexes. Among the 

 females, wingless forms are common, and in many cases are totally 

 different from the males, so that the sexes are not easily correlated. 



Many of them, too, were it not for their oblong heads, could be easily 

 mistaken for apterous females in the families Thynnidae and Mutillidae. 



Table of Genera. 



1. Males l8 - 



Females. 



Wingless forms 2 - 



Winged forms J °- 



2. Head with ocelli 9- 



Head without ocelli ; antennae 13-jointed 3- 



3. Metathorax quadrate or nearly, not much constricted at the base. . 5. 

 Metathorax not quadrate, much constricted or strangulated at base. 4. 



4. Scutellum present j mandibles 3- or 4-dentate ; maxillary palpi 



6-jointed (0 Pristocera, Klug. 



(Type Bethylus depressa, Fabr.) 

 Scutellum wanting; mandibles 3-dentate ; maxillary palpi 6- 



jointed ( 2 ) Isobrachium, Forster. 



(Type Omalus fuscicornis, Nees.) 



5. Scutellum present ; metathorax quadrate or trapezoidal 6. 



Scutellum wanting ; metathorax rounded off 



posteriorly (3) Ecitopria, Wasmann. 



(Type E. crassicornis, Wasm.) 



6. Mandibles 2- or 3-dentate ; maxillary palpi 4-jointed 7. 



Mandibles 4-dentate ; maxillary palpi 5- 



jointed (4) Scleroderma, Latreille. 



(Type S. domesticus, Latr.) 



