H28 S. W. WillistoH — North American Conoj^s. 



covering the sides of nietanotum ; front mostly yellow ; face, cheeks, 

 and under part of occiput yellow ; facial grooves with a black spot 

 on each side of middle. xanthopciTeus^ n. sp. 



e. — The brown of the wings fills out the discal cell to beyond the 

 great cross-vein. f. 



— Outer portion of discal cell from near the small cross-vein dis- 

 tinctly lighter or hyaline. g". 



f. — Cheeks uniformly black; dust on the humeri indistinct ; pos- 

 terior orbits with a very narrow whitish line. (Black species.) 



tihialis Say. 



— "Cheeks brownish yellow; posterior orbit with yellowish brown 

 border; humeri dusted with golden yellow." genualis IjW. 



— Cheeks with a yellow spot in the middle, brown in front and 

 behind; humeri with distinct yellow dust. j sagittarivs Say. 



( eastanopterus Lw\ 



g-, — Cheeks uniformly black or brown ; basal joint of antennae very 

 short. " h. 



— Cheeks with a yellow spot in the middle; first joint of antennae 

 but little or not at all shorter than the third. i. 



ll — Front with deep black transverse and median divaricate 

 stripes. (Dark-colored species.) fnrciUatus, \\. sp. 



— Front with very narrow reddish stripes or wholly yellow ; dor- 

 sum of thorax with a broad, median, posteriorly abbreviated, black 

 stripe. (Reddish species.) Bicrr/essi, n. sp. 



i. — Ultimate segment of fouith vein nearly twice as long as the 

 penultimate ; dorsum of thorax with a narrow, median, black stripe. 

 (Reddish species.) texamis, n. sp. 



— ^Ultimate segment of fourth vein but little oi- not at all longer 

 than penultimate. k. 



k. — Facial grooves and frontal stripes black. (Dark-colored 

 species.) tnarginatus Say. 



— P'acial grooves but little or not at all darkened ; frontal stripes 

 nearly or quite obsolete; dorsum of thorax with three black stripes, 

 narrowly separated or confluent, the median one more abbreviated 

 behind. affi^nis, n. sp. 



Conops obscuripennis, n. sp. 



/ . Face and cheeks yellow, facial grooves not darkened; near the 

 orbits a ratiier broad, glistening, yellow border, extending as a line 

 to the vertex. Proboscis nearly black, about as long as the antennae, 

 much swollen at the base. Anteinue nearly black, first and third 

 joints reddish below, of nearly equal length, scarcely more than one- 

 half as long as second joint; second joint of style moderately project- 

 ing; third joint gradually tapering, of medium length. Front 

 wholly black; with a coppery luster, when viewed obliquely. Occi- 

 put black, with a rather narrow golden yellow boi-der along the 

 orbit. Thorax black; spots on the inner sides of the humeri, the 



