158 LENG AND HAMILTON'. 



[Very like canesceiis, but the pubescence and hairs are black and 

 longer ; the coloration is the same.] " Ham." 



T. luoiiostigina Hald., 1847 (Oberea), Traus. Am. Phil. Soc. x, 57 ; Lee, Jour. 

 Ac. Nat. Sci. ser. 2, ii, 156. 

 Length 7.5 mm. = .30 inch. Habitat. — Pennsylvania. 



[Tliis species differs i'romjucunda by its smaller size and red legs ; 

 the thoracic callus is also smaller. This and jucunda are very rare, 

 and have not been seen.] " Ham." 



TETRAOPES Serville. 

 The following synopsis is by Dr. Geo. H. Horn, Tr. Am. Ent. 

 Soc. vii, 48 : 

 Elytra with median and apical cordiform black space. 



Disc of thorax black; thoracic umbone suddenly elevated . . . -discoidetlS. 



Disc of thorax red ; umbone gradually convex cauteriator. 



Elytra black, with a red basal baud, and triangular red spot behind middle. 



elegaus. 

 Elytra with black spots. 

 Anteuuie black, not annulate. 

 Abdomen very sparsely, scarcely visibly punctulate; mandible of % with 



deep sinuation at base tetraophtlialiutis. 



Antennse more or less distinctly annulate ; abdomen densely but very finely 

 punctulate ; mandible of % with moderate sinuation. 

 Claws rather deeply bifid ; surface rather sparsely clothed with recumbent 

 pubescence and with semi erect hairs visible on the disc. 

 Thoracic umbone suddenly elevated, distinctly limited at the sides. 

 Surface of umbone opaque ; abdomen scarcely punctulate. collaris. 

 Surface of umboue shining; abdomen densely punctulate. 



femoratus. 

 Thoracic umbone gradually convex ; antennse feebly annulated. 



Antennae and legs dark quiuqueiuaculatus. 



Scape and femora red var. texai) us. 



Claws feebly cleft at tip ; surface more densely clothed with recumbent 



pubescence, erect hairs very short and visible only at sides and tip. 



Thoracic umbone gradually convex, lateral tubercle not very prominent. 



canesceiis. 



All the s])ecies of Tetraopes appear in advanced Summer, and 

 breed in the stems and roots of milkweed {Asclepkis). 



T. discoiUeus Lee, 1858, .lour. Ac. Nat. Sci. ser. 2, iv, 26 ; rubrocinereiis 

 Thoms.. 1860, Classif. Longicorn p. 67. 

 Length 7-8 mm. = .28-. 32 inch. Habitat. — New .fersey, New Mexico, Texas, 

 Arizona, Idaho. 



[Black, clothed with sparse cinereous pubescence njixed with black 

 hairs ; antenuje black, not annulate ; thorax red at base and apex ; 

 with four black .spots on the disc; elytra red, with l)lack markings 



