36 MELANDER AND BRUES. 



Insect almost wholly black 2 



With conspicuous yellow markings 3 



2. Abdominal spots larger ; body less coarsely punctured ; subtegular tubercle black; 



g , 9.5 mm pullatus Schuck. 



Abdominal spots smaller ; body strongly punctured ; subtegular tubercle yellow; 

 <J , II mm hollensis, var. nov. 



3. Second abdominal segment fulvous with a large, subquadrate, black spot on each 



side, and a transverse lateral white spot at tip pulchellus Cress. 



Second abdominal segment black with at least a tranverse yellow stripe 4 



4. Scutellum wholly yellow ; 7 mm sulcatus Davis 



Scutellum somewhat black in middle ; larger 5 



5. Coxae and femora black ; wings with subapical cloud 6 



Coxae yellowish, femora dark fuscous ; wings fuscous along costa . costalis Cress. 



6. Head confidently punctured nevadensis Cress. 



Face above antennae, and vertex impunctate canadensis Harntgn. 



TRIGONALYS PULLATUS Shuck, var. HOLLENSIS, var. nov. 



Male. Length," 1 1 mm. Black, coarsely punctured, with almost seri- 

 ceous, short white pile proceeding from each puncture, and covering whole 

 insect. Antennae with twenty-four joints, black, filiform, slender, the 

 middle joints stouter than the others, the joints evenly decreasing in length 

 to the pointed tip ; scape black. Head strongly, closely punctured ; an- 

 tennae inserted in upper portion of transverse broad depression. Mandi- 

 bles prominent, broad, with three or four well-marked teeth. Maxillary 

 palpi slender, six-jointed ; labial palpi consisting of three stouter joints, 

 the last securiform. Tegulae piceous ; tubercle below teguls 3 yellow. 

 The punctation of the thorax is more rugose than that of head or abdo- 

 men. Parapsidal depressions well marked, as is also a central longitu- 

 dinal groove. Scutellum prominent, with median longitudinal groove, 

 and deeply foveate at sides. Postscutellum strongly fossate at sides. 

 Metathorax rugosely reticulate on posterior declivity. First segment of 

 abdomen short, triangular, second largest, four times length of first, 

 third one half length of second, rest of abdomen incurved, not visible 

 from above, fourth and fifth segments subequal, sixth provided with 

 a rough series of small tubercles. At the apex of the abdomen are 

 two short claspers. Second, third and fourth segments each marked 

 with an inconspicuous yellow lateral spot near posterior margin. First 

 and second ventrals equivalent to first and second dorsals, remaining 

 segments much smaller on account of the infolding of the abdomen : sec- 

 ond ventral provided with a subapical, flat, median tooth, beyond which 

 the abdomen is deeply notched ; last ventrals carinate in middle. Legs 

 marked with yellow as follows : exterior faces of all tibiae, broadly inter- 

 rupted on middle pair and narrowly on posterior ones, exterior face of 

 front metatarsi, and exterior two thirds of middle and hind metatarsi. 

 Pectus swollen, deeply, longitudinally grooved. Wings hyaline at base, 

 with a slightly infuscated cloud on apical third : subcostal and externo- 



