432 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 57. 



2. Basal area triangular, separated from areola by a longitudinal carina; no carina 



from spiracle of first tergite to apex of segment; first three tergites with large 

 punctures; lateral dorsal angles of pronotam strongly tuberculate; vertex anteri- 

 orly shining, practically without sculpture; third tergite cf male without basal 



lateral triangular area (group humeralis) 3. 



Basal area and areola confluent; a distinct carina from spiracle of first tergite to apex 

 of segment; first three tergites smooth or aciculate; lateral dorsal angles of pro- 

 notum not especially prominent; vertex sculptured; third tergite with a trian- 

 gular-shaped lateral area at base (group maudae) 5. 



3. Wings uniformly brownish; body rufopiceous piceatus (Rohwer). 



Wings hyaline or with brownish marks; body black 4. 



4. Wings with a brownish band below stigma ausiralis (Cresson). 



Wings uniformly subhyaline humeralis (Say). 



5. Female anteonae with small annulus; first tergite black; male vrith abdomen en- 



tirely red neoclyti (Rohwer) . 



Female antennae black; first tergite rufous; abdomen in male black or wn.th first 

 two tergites reddish maudae (Davis). 



6. First tergite short distinctly constricted medianly; orbits impunctate; black 



species (group frigidus) 7. 



First tergite not constricted medianly 8. 



7. Plrst tergite of female vdth two dorsal carinae from constriction to apex of tergite ; 



male not known frigidus (Cresson). 



First tergite of female without median dorsal carinae from constriction to apex, 

 see description of male yuhonensis (Rohwer). 



8. First tergite with prominent median carinae which may extend to apex of segment; 



posterior orbits always with a white spot 9. 



First tergite without median carinae or if present in males the color does not agree; 

 posterior orbits without a white spot 11. 



9. Facial quadrangle longer than broad; face almost impunctate; scutum polished, 



sparsely punctured; base of third tergite in male with a depressed area laterally; 



abdomen black with white marks (group albopictus) 10. 



Facial quadrangle broader than long; face with distinct punctures; scutum opaque 

 with close poorly defined punctures; third tergite in male without a depressed 

 area; abdomen unicolorous (group calidus) calidus (Provancher). 



10. Basal area triangular and separated from areola by a carina, .alhopictus (Cresson). 

 Basal area and areola confluent duplicatus (Rohwer). 



11. Posterior orbits smooth or with a few punctures below (group rileyi) 12. 



Posterior orbits obliquely striate 13. 



12. Tibiae black; hind coxae rufous ruficoxis (Rohwer). 



Tibiae with a white annulus at base; hind coxae usually black but occasionally 



rufous rileyi (Ashmead). 



13. Vertex smooth, with only a few scattered pimctures; antennae of female black. 



(group insularis) 14. 



Vertex closely punctured or punctato-striate; antennae of female vrith an annulus. 



(group stlgmapterus) 15. 



14. Posterior dorsal margin of pronotum yellow; second and third tergites transversely 



aciculate; scutum shining, sparsely punctured insularis (Cresson). 



Pronotum black; second and third tergites granular; mesonotum punctate to 

 striato-punctate eastoni (Rohwer). 



15. Females 16. 



Males (only four species are known in this sex) 21. 



16. Heavily chitinized part of first sternite medially terminating distinctly before 



a line drawn tangent to the posterior margin of the spiracle of first tergite ; carinae 

 dividing meta-pleura and -sternum terminating much before hind coxal fossae; 

 abdomen broader „ . . 17. 



