916 AN INTRODUCTION TO ENTOMOLOGY 



K. Prothorax, mesothorax, and propodeum more or less 

 intimately fused into a chitinous box; usually with 

 little or no trace of sutures, more rarely with the sutures 

 visible but connate; still more rarely the prothorax 

 is fully separated. 



L. First tergite not reaching the base of the petiole, 

 but forming an apical gibbous cap thereto. Pro- 

 thorax separated. (Apterogyninae and Chyphotinse.) 



p. 953 MUTILLID^ 



LL. First tergite reaching the base of the petiolar 

 segment. 



M. Upper surface of posterior coxae with an erect 

 inner lamella at base. Pronotum separated from 

 mesothorax by a movable suture. (Myrmosina;.) 



p. 953 TiPHiiD.« 



MM. Posterior coxae simple. Pronotum and pro- 

 podeum fused to the thorax, the sutures lacking. 



Ocelli wanting, p. 953 Mutillid^ 



KK. Prothorax, mesothorax, and propodeum fully 

 separated. 



L. Hind edge of mesosternum with two horizontal 

 lamellae between the middle coxae, which they 



partly overlap, p. 952 Thynnid^ 



LL. Mesosternum without such lamellce overlapping 

 the bases of the coxae. 



M. Mesosternum with two minute, erect teeth 

 between the middle coxae. Mesothorax elongate. 

 Moderately large ant -like insects. (Methocinae.) 



p. 953 TiPHiiD^ 



MM. Mesosternum unarmed. Mesothorax rarely 

 elongate. 



N. Head oblong, porrect; antennae inserted close 

 to the mouth, never geniculate. Femora, es- 

 pecially of the fore-legs, usually strongly thick- 

 ened in the middle. Scutellum without pits. 



p. 965 Bethylid.^ 



NN. Head usually globular or transverse. An- 

 tennae inserted in the middle of the face. Fem- 

 ora not medially strongly thickened. Scutellum 

 usually foveolate. 



O. Antennae geniculate. Scutellum with deep an- 

 terior iovese; or if these are absent it is not 

 distinctly separated from the mesonotum. 



(Sixteen genera.) p. 932 Belytid^ 



00. Antennae not geniculate. Scutellum dis- 

 tinct, without fovese. (New genus in Myr- 



mosinae.) p. 953 Tiphiid^ 



JJJ. Antennae of from thirteen to fifteen segments. 



K. Antennae inserted close to the mouth. Head oblong, 



porrect. Anterior femora spindle-shaped, p. 965 



Bethylid.e 



KK. Antennae inserted on the middle of the face. Head 

 globular or transverse. 



L. Abdomen produced behind into a pointed tube. Spur 

 of the anterior tibiae without a ventral blade-like 

 lamella. (Three genera.) p. 931 . . . Proctotrupid^ 

 LL. Abdomen not produced behind into a tube. Spur 

 of the anterior tibiae with two prongs and no ventral 

 lamina. Anterior femora clavate. p. 932 . Bely'Tid^ 



