SNOW: DESCRIPTIONS OF NORTH AMERICAN TRVPE'I'I D.i:. l6l 



first vein, a larger similar space on the posterior border of wing 

 in second posterior cell, and the larger part of the third posterior 

 cell. Accordingly the black of the submarginal, first posterior, first 

 basal, and discal cells is entirely unrelieved. The other specimen 

 has very strong, truncate frontal bristles, lateral stripes on thoracic 

 dorsum, black spots at the corners of scutellum and large black spots 

 on metanotum. The picture of the wings is a deep brown, and differs 

 from wA.x\Q.\.y perfect a in its darker color, and the brown rivulets being 

 much broader and consecjuently to a great extent confluent. The 

 area enclosed by the second and fifth longitudinal veins is brown 

 except for (i) a hyaline spot reaching from the costa to the third 

 vein and answering to the anterior end of the liyaline band which 

 passes between the cross veins in pcrfccta, etc.; (2) a subtriangular 

 hyaline spot in the discal cell below the small cross vein and corres- 

 ponding to the posterior end of the band above alluded to; (3) a large 

 clear scallop in the second posterior cell; and (4) a triangular spot 

 above the end of the fourth vein. A third male specimen resembles 

 the latter except that the brown picture of the wing is more encroached 

 upon by the hyaline. 



The material at hand, though not large, is sufficient to show the 

 inadvisability of erecting any of the members of this group to the 

 importance of species, though specimens may be selected which 

 present a vivid contrast.. It is even almost impossible to characterize 



distinct varieties. The most constant character for such differentia- 

 » 

 tion lies apparently in the relative size of the frontal bristles in the 



males. In regard to the characters of the wing pattern there are not 



only gradations between seemingly distinct varieties, but even the two 



wings of an individual show considerable differences. Characters 



derived from the picture of the thorax are also very unstable. 



Spilograpba electa Say. 



Six specimens, Douglas county, Kansas, Connecticut, Georgia 

 (Morrison). This species has been bred from Solatium carolinense. 

 The male scarcely differs from the female of Loew's description. 

 One specimen has smoky wing bands rather than brown ones. 



CEdicarena diffusa n. sp. (PI. VH, f. '.•). 



Male and female. Large, yellow, bristles and hairs unicolorous. 

 Head swollen, front rather broad, projecting anteriorly, bristles 

 strong. Third antennal joint very short, rounded, arista slender; 

 second joint with bristlet. Face white, in profile receding, a little 

 prominent near the middle; antennal foveje well marked, separated by 

 a broad triangular area. Cheeks broad, hairy, with one hair bristle- 



