OF THE TABANID^ OF THE UNITED STATES. 391 



C. arcolatus a specimen which had the centres of the cells on the disc of a faded brown, as 

 is often the case, without constituting a specific character. In the description of the abdo- 

 men some omission has occurred, which renders it incomprehensible. 



20. Chrysops striatus n. sp. 



? Chrijsops furcatus "W.alker, List, etc., i, p. 199. 



Chrijsops vittatus Bcllardi (iiec Wiedein.) Snggio, etc., i, p. 74. 



9 . The hyaline triangle separating the crossband from the apical spot does not reach the second longitudi- 

 nal vein; first bas.al cell to a considerable extent infiiscated, the second altogether hyaline; frontal tubercle 

 black; scutellum blacJcish at base, reddish at tip ; .abdomen yellow, with four longitudinal black stripes. 



Length, 7-9 mm. 



Female. Very like that of C. vittatus in its general appearance and in the coloring of 

 its wings. It differs however in the following points : the foce is ferruginous, but the facial 

 callosities are usually brownish ; the frontal callosity is black and the pollen on the front 

 greenish-gray ; the coloring of the thorax is less yellow, the median strij^e being greenish- 

 gray, with a brown line in the middle ; the scutellum is more or less blackish at the base, 

 the posterior half only being reddish ; the longitudinal tripes on the abdomen are darker 

 and better marked, especially on the first two segment , where, in C. vittatus, they are 

 very often somewhat faded ; the fifth posterior cell is usually hyaline, and not invaded by a 

 brown cloud, issuing from the crossband ; the latter is limited posteriorly by the intercalary 

 vein ; the apical spot is smaller, occupying only the anterior portion of the second sub- 

 marginal cell ; the brown at the base of the second basal cell is confined to a small spot. 

 Venter yellow, with a broad median brown stripe, attenuated anteriorly, and two narrow 

 lateral stripes. 



Hah. District of Columbia ; Illinois. Six females. 



I have two doubtful specimens from Illinois (Le Baron), with the thorax and wings of C 

 striatus, but wdth reddish facial and frontal tubercles. 



Mr. Walker's description of C. furcatus seems to fit the present species better than any 

 other ; nevertheless, important discrepancies in the description prevent me from admitting 

 the synonymy. Bellardi's C. vittatus is very likely this species, and certainly not C. vitta- 

 tus Wied. (compare the color of scutellum and of the frontal tubercle). 



21. Chrysops hilaris n. sp. 



5 . Apical spot separate! from the crossband by the tip of the hyaline triangle, which reaches the cost.i ; 

 both basiil cells hyaline ; the crossband does not quite reach the hint margin. Frontal and ficial callosities 

 black ; third and fourth abdominal segments with four black longitudinal spots, alternating with yellow ones, 

 sometimes coalescing in such a way as to leave but a yellow longitudinal stripe and lateral yellow spots. 



Length, 8-9 mm. 



Female. Face yellowish-ferruginous, fixcial callosities black ; palpi reddish-yellow ; front, 

 antennse and thorax as in the preceding species. Abdomen : first two segments yellow ; the 

 first with two black, rounded spots, separated by a yellow space, under the scutellum ; the 

 second with two short, diverging black streaks in the middle, which neither meet nor touch 

 the anterior margin ; the posterior margin they sometimes touch, sometimes not ; the third 



