476 PROCEEDINGS OF THE ACADEMY OF [DeC, 



— . \'ertex twice as long as broad; front white without a basal band, 

 abdomen red, colorata Van D. 



2. Front transversely banded, 3. 



— . Front imicolorous, perhaps shading a little darker toward the base, 



not banded, 4. 



3. Front brown, base abruptly darker; elytra narrow, parallel, wider 



toward the apex, indistinctly variegated or irrorated ; pronotum 

 deeply, angularly emarginate behind, . . Slossoni Van D. 

 — . Front creamy white with a fuscous base and brown clypeus ; elytra 

 expanded, the costal edge quite uniformly rounded; surface 

 distinctly variegated ; pronotum obtusely emarginate behind , 



pallida Say. 



4. Vertex as long as broad; pronotum strongly produced, truncated 



between the eyes; elytra brown, very obsoletely variegated; 

 front unicolorous, pale testaceous brown; venter blackish 



fuscous, septentrionalis Prov. 



— . Vertex distinctly broader than long; pronotum less produced, 

 rounded before between the eyes; front irrorate, shading to 

 darker at base; elytra variegated, . . . variegata Van D. 



Helicoptera vestita Prov. is evidently a sj^nonym of opaca Say. 

 Monopsis floridw and fusca Walker are placed by Stal in Helicoptera, 

 but they are unknown to me in nature. 



Helicoptera opaoa Say. 



This large and broad species is black with the elytra more brownish 

 and opaque, the areoles closely and minutely dotted with pale and with 

 a pale stigmatal spot; the face is deep black with a broad transverse 

 band of yellowish white covering the front to the superior line of the 

 eyes. This pale band is extended more narrowly along the sides of the 

 pleurae. Antennae pale fulvous. This seems to be a rare and local 

 form. I took one example at Phoenicia, in the Catskills, in August, 1904, 

 and Mr. John D. Evans, of Trenton, Ontario, has sent me another for 

 study that he took in County Hastings, Ontario. Mr. Evans' speci- 

 men, which is a male, has the pronotum and disk of the vertex 

 obscurely irrorate with pale. I have seen one or two additional speci- 

 mens in other collections. 

 Helicoptera colorata n. sp. 



Allied to opaca, but smaller and narrower with a strongly produced 

 vertex. Black, front and vertex white, venter sanguineous. Vertex 

 long, moderately narrowed toward its rounded apex, its length a little 

 more than twice its width at base; median line almost obsolete, disk 

 soiled white, margins strongly reflexed, black. Front long, much 

 narrowed toward the base, precurrent median carinas feeble; reflexed 

 margins expanded tow^ards the base of the clypeus; white wnth the 



