Nineteenth Annual Meeting. 133 



pubescence on the posterior segments. Legs black, the four posterior tarsi a little 

 reddish at base. Wings with dark-brown markings, filling out two-thirds or more of 

 both basal cells, the cross-band not reaching the posterior margin, but including the 

 base of the fifth posterior cell. The apical costal spot is diffuse, and reaches only a 

 little way into the second submarginal cell, and is separated from the cross-band by 

 the hyaline continuation of the halo, which reaches quite to the costa. 



Eight specimens, Washington Territory. In some the legs are more brownish. 

 The species approaches C celer most closely, but will be at once distinguished by 

 the apical costal cloud, and by the less bushy gray, not fulvous, pile of the pleurse. 



Chkysops moechus Osten Sacken. 



One specimen from Cumberland Gap, and one without locality. The latter is on 

 the same pin with a specimen of C. pudicus Osten Sacken. 



Cheysops fbazabi, n.sp. 



Female: Length 8 mm. Front yellowish gray, the large callosity black. Face 

 grayish yellowish on its borders, elsewhere luteous yellow shining. Antennae elong- 

 ate, the first two joints together considerably longer than the third, the first joint 

 considerably thickened; first joint re.ldish, second joint reddish brown, third black. 

 Dorsum of thorax blackish brown, with four very distinct yellow poUinose stripes, 

 the median ones remote, slender, broadly interrupted posteriorly, and contiguous on 

 the front margin with the broader entire lateral ones. Pleurae brownish black, with 

 six distinct spots of yellow jiollen, the smallest just above the front coxse. Abdo- 

 men dark brown, the first segment with two small yellow pollinose spots on each 

 side, the posterior ones obsolete; second segment with a median stripe, the large 

 anterior angles reaching the whole length of the segment, and two spots behind, 

 the next three segments each with three small, more or less confluent spots on the 

 hind margin, the third segment with an additional median one in front. Wings al- 

 most pure hyaline, with distinctly limited dark-brown markings as follows: Anterior 

 margin to the apex not, or but faintly, encroached upon in the marginal cell beyond 

 the cross-band, the extreme base of both basal cells, and the cross-band, reaching to 

 the hind margin at the tip of the first posterior and anal cells, leaving a hyaline sinus 

 in the fifth posterior cell posteriorly. Legs luteous yellow, the knees and more or 

 less of all the tibia?, especially of the hind pair, and tarsi, brown or blackish; hind 

 tibiae with a distinct fringe of black pile outwardly. Venter dark brown, with two 

 broad yellow stripes. 



One specimen, San Domingo (G. F. Frazar). 



Chbysops sequax, n.sp. 



Female: Length 8,9 mm. Front yellowish gray, the callosity black. Face mostly 

 black, bare, reddish yellow, the callosities more or less black. Antennae elongate, 

 slender, the first joint longer than the second, the two together about as long as the 

 third; first two joints yellowish, the third almost wholly black. Palpi yellowish or 

 brownish. Dorsum of thorax with four broad, distinct stripes, the lateral ones more 

 yellow, the median ones greenish yellowish gray and separated by a slender stripe. 

 Pleurae grayish yellow pollinose, with a longitudinal black stripe. Abdomen yellow, 

 brownish or blackish distally, with four distinct black stripes reaching from or near 

 the base, the lateral ones slender or partially obsolete anteriorly. Scutellum some- 

 times yellow on its border. Ventor yellow, with a broad median and a more slender 

 lateral black stripe. First basal cell of the wings wholly filled out with brown, the 

 second hyaline; the cross-band reaches the hind margin, but the fifth posterior cell 

 is largely hyaline at its base; anal cell open; wings broadly clouded distally, mcluding 

 nearly all of the second submarginal cell, and encroaching upon the first posterior, 

 the hyaline arcuation between the cross-band and spot slender, scarcely transcending 



