424 MEMOIRS OF THE CARNEGIE MUSEUM 



each side, meso- and metapleura marked with yellow ; hind femora yellow with four black spots on 

 the outer face and one small spot on the inner face ; abdomen short ovate, the petiole about four 

 times as long as thick, the segments 3 to 8 at sides banded with black or ftiscous S. marginata. 



31. Face with a long acute tubercle between the insertion of the antennae, yellow, a large triangular black 



spot on middle mesothoracic lobe, the outer margins of the lateral lobes, mesopleura, and spot on 

 metanotum black ; abdomen pale ferruginous ; ? S. tuberculata. 



32. Middle mesothoracic lobe with a large triangular black spot or black with the sides and the base (the 



part nearest the scutellum) yellow, the lateral lobes also margined outwardly with yellow 33 



Middle mesothoracic lobe with one or more black lines, the lateral lobes usually immaculate.. . . 44 



33. Scutellum yellow with a central black line or spot, the axillae not entirely black, usually yellow with 



a black spot 34 



Scutellum yellow with a large quadrate black spot at base, the axillae black. 



Scutellum at apex emarginate or bidentate ; hind femora marked with black ; their tibiae bian- 

 nulate with black ; abdomen conic-ovate, the petiole not more than thrice as long as thick. 



S. bidentata. 



34. Occiput and the vertex yellow, the scrobes always yellow 42 



Occiput and the vertex black, the scrobes always black. 



The triangular black spot on the middle mesothoracic lobe wiihovt a central yellow spot. . . 35 

 The triangular black spot on the middle mesothoracic lobe with a central yellow spot 39 



35. Mesopleural furrow (the femoral furrow of the mesopleura) black 36 



Mesopleural furrow not black 37 



36. Hind femora outwardly with a large broad black spot near the base, a small black spot at apex and 



another above it on the upper margin ; abdomen siibglobose, the petiole about four times as long as 



thick S. maculata, sp. nov. 



Hind femora immaculate, except a black spot within near upper margin ; abdomen oblong oval, 

 faintly tinged with piceous, the petiole three times as long as thick (cf ), in female long fusiform or 

 lanceolate, the petiole short, transverse S. hempeli. 



37. Hind coxae with a black stripe or spot above 38 



Hind coxae immaculate. 



Hind femora with a large black spot on upper margin within ; scutellum yellow with a median 

 black line S. hempeli. 



Hind femora immaculate ; abdomen fusiformly pointed, some of the dorsal segments banded 

 with fuscous, the petiole four times as long as thick ; $ ; scutellum with a large black spot 

 on the disk S. devia. 



38. No new species fall in here. 



39. Meso ■ and meta-pleura yellow, except sometimes a black spot in the femoral furrow 40 



Meso- and meta-pleura, except a spot beneath the insertion of the wings, black. 



Hind coxae black at apex, the hind femora yellow with a large black spot across from the large 

 basal tooth and another smaller spot at apex, the hind femora with a black aunulus at base ; 

 body of abdomen short, dusky above ; ? S. nigropleuralis. 



40. Hind femora immaculate 41 



Hind femora with one or two black spots. 



Hind femora with two black spots ; abdomen short ovate, shorter than the head and thorax 



united, the petiole about thrice as long as thick ; 9 S. bimaculata. 



Hind femora with one black spot ; abdomen oval, the petiole only twice as long as thick ; (J'. 



S. corumbicola. 



