SAHCOPHAGA AND ALLIES 247 



14. Scutellmn with a pair of small apical 



bristles between the large marginals 15 



Scutellum without small apicals 20 



15. Back of head with two rows of black hairs 



behind eye 16 



Back of head with three rows 17 



Back of head with three rows above, running 

 out to one near lower edge of eye (South- 

 ern Alabama to Brazil) 



No. 127. sternodontis Tns. 



16. Large, stout species without median mar- 



ginals on third abdominal segment (wide- 

 spread south; Seattle) 



No. 128. rohusta n. sp. 



Small tropical species; median marginals 



present on third abdominal segment 



(West Indies) No. 129. hakeri n. sp. 



17. With a recurved, divided hook on the back 



of penis near tip (Georgia, Louisiana) 



No. 130. hamata n. sp. 

 Not with such hook 18 



18. Frontal rows suddenly divergent at lower 



end 19 



Frontal rows slightly divergent ; pollen of 

 head, sides of thorax, and sides of abdomen 

 yellow (Guatemala) 



No. 131. ocantliosoma n. sp. 



19. Outer vertical present; forceps with dense 



erect short hair almost at tip (wide- 

 spread) No. 132. utilis Aid. 

 Outer vertical absent; forceps bare (Mis- 

 souri, Georgia, Florida) 



rileyi, j one si and celarata, in Group G 



20. Front nearly as wide as one eye (New Jer- 



sey) No. 133. cistudinis n. sp. 

 Front much narrower 21 



21. Fifth sternite with stout arms diverging V- 



shaped (Indiana) No. 134. galeata n. sp. 

 Fifth sternite with the sides not diverging 22 



