36 PSYCHE. [March ,S,7. 



6. Hind process of proiiotum acute-angled in dorsal view, its sides con- 

 cave. Carina of pronotum in side view crestlike, liigli, arched, com- 

 pressed (Fig. i6). Dusky hand of wing with sub-frontal shoot extending 

 usuall}' one-fourth to one-third the distance across disk to base of wing. 



Sp. 1 6, ArpJiia xanthoptera. 

 6'. Hind process of pronotum about right-angled, (J, or a little obtuse, 9 ; 

 carina rather low (Fig. 17). Dusky band of wing with sub-fiontal shoot 

 usuallv extending two-thirds of the distance to base of wing. 



Sp. 17, ArpJiia sulp/no-ea. 

 5^(5'-^). Carina of pronotum with one notch or incision in side view. Scu- 

 tellum of vertex without deep transverse arcuate impression. 



7. Width of dusky wingband taken on subfrontal shoot two or three times 

 its width elsewhere (Fig. 21a). Antennae short, equal to head plus 

 pronotum or but little longer (if longer the prozona and metazona of 

 equal length). Robust species. 



8. Prozona distinctly shorter than metazona. Vertex prominent (Fig. 

 21). Hind process of pronotum acute or 1 ight-angled. Wings usually 

 red. Antennae short, equal to head plus pronotum. 



.Sp. 2 I , Hippisciis tuberciilal/is. 

 S'. Prozona and metazona of equal length; the lateral carinae not cut 

 by principal sulcus (Fig. 22). Vertex convex, the scutellum but 

 little impressed, divided by a median and two oblique carinulae. 

 Hind process of pronotmn obtuse-angled. Wings usually yellow- 

 ish, sometimes orange or red. . Sp. 22, Hippisciis rug'os/ts. 

 7'. Width of dusky wingband on subfrontal shoot rarely over once and 

 a half its width elsewhere. Antennae long, once and a half or twice 

 as long as head plus pronotum. Slenderer species, the body often 

 compressed. 

 9 (9') 9^)- Hind tibiae not dusky-iinged. Hind part of disk of prozona 

 elevated, rising broadly on the carina. 

 10. Carina high, arched; the cleft oblique, the lobes sometimes over- 

 lapping (Fig. 24a). Hind process acute, its sides concave (Fig. 

 24.) Hind tibiae red, sometimes paler at base. 



Sp. 24, Spharagemoii collare scudderi. 



10'. Carina rather low, usually sinuate on prozona; cleft nearly 



or quite vertical (Fig. 25a). Hind process about right-angled, 



its sides straight (Fig. 25). Hind tibiae distinctly pale-ringed 



next base. . . . Sp. 25, Spharaffemoii saxatile. 



9' (9'). Hind tibiae ringed with dnskv and coral-red, and pale next 



base. 



