OF THE TABANID^ OF THE UNITED STATES. 387 



16. Chrysops univittatus. 



Uhrysops univittatus Mncqnart, Dipt. Exot., 5° SiippL, p. 36. 

 ? Chri/sops fasctjieiiids Maequart, Hist. Nat. Dipt., i, p. 216. 



? . Tiie hyaline interval between the crossband ami the ajiieal spot docs not rcacli tlie second longitufllnal 

 vein; first basal cell altogether infiiscaterl, the second almost hj-aline ; apical spot large, invading the first 

 posterior cell; a broad yellow longitudinal stripe in the middle of the abdomen, enclosed between two brown 

 stripes; tip of the scutellum more or less reddish. 

 Length 6-7 mm. 

 $ . A considerable portion of the second basal cell is infuscalcd. 



Female. Face ferruginous, facial callositie.s often brownish ; frontal callosity large, Ijlack. 

 Antennre : basal joints and base of the third joint reddish, the remainder black. Thorax 

 with the usual stripes ; the median stripe greenish-gray, divided by a brown longitudinal 

 line ; the lateral ones yellow. Scutellum blackish at base, reddish at tip, the extent of 

 both colors being variable. Abdomen yellow ; a broad yellow stripe extends from the 

 base nearly to the tip ; it is liounded on both sides by brown stripes, which tisually become 

 much broader on the third and following segments; the tip of the abdomen is altogether 

 brown ; venter yellow, with a broad brown middle stripe, attenuated anteriorly, and narrow 

 lateral bro^\ai lines. Legs reddish ;' latter half of front tibitc and the front tarsi black ; tips 

 of the other tarsi brownish. Wings : costal and first basal cells brown ; crossband limited 

 posteriorly by the intercalary vein and filling out the fourth po.sterior cell; apical spot 

 large, reaching the second posterior cell and separated from the crossband Ijy an elongated 

 hyaline space, very irregidar and jagged on its distal side, and having its apex immediately 

 above the proximal end of the second submarginal cell ; there is a distinct brown cloud at 

 the distal end of the anal cell, on the margin of the wing; fifth posterior cell usually hy- 

 aline ; second basal cell with a brown streak on its proximal half. 



Mab. District Columbia, Maryland, New Jersey, Connecticut, Kentucky (F. G. Sanborn). 

 Eleven females. 



A male, apparently belonging to this species (Tarrytown, N. Y., in June), has all the 

 characters of the female, except that the thorax is more Ijrownish and hairy ; the brown 

 stripes on the abdomen are not expanded posteriorly ; and the brown color in the second 

 basal cell is more extensive. The identity of this species with Macquart's C. wiiviUatus 

 can hardly be called in doubt. 



C . fascijiennis Macq., Hist. Nat. Dipt., i, p. 21G, is certainly one of the common species 

 of the genus, but the shortness of the description renders the identification impossible. As 

 far as it goes, the description reminds one of C. unioiiiahis Macq., more than of any other 

 species, especially if Ave take into account the statement about the small size of the species 

 (3| 1.). Macquart has, more than once, described his own species a second time. 



17. Chiysops moechus n. sp. 



? . Apical spot altogether coalescent with the crossband, the hyaline triangle between them being small, 

 included within the third and Iburth posterior cells; abdojiien yellow, with more or less broad brown strijjcs ; 

 scutelluui more or less yellowisji. 



$. Body altogether black, thorax with greenisli-yellow lateral and pleural stripes; wings altogether 



