394 C. R. OSTEN SACKEN'S PRODROME 



usually blackish, with a vestige of reddi-^h at the root of the third joint (compare the ob- 

 servation at the end of this description). Thorax blackish, with a broad gray median 

 stripe, divided by a longitudinal blackish line ; lateral grayish stripes above the root of the 

 wings ; pleura3 grayish, with a blackish stripe. Abdomen grayish, with faint bilobed black- 

 ish spots at the base of the segments ; grayish golden hairs on all segments, especially on 

 the hind margins ; venter blackish-gray, hind mai'gins of the segments lighter gray. Legs 

 black ; tibias, except the ends, and base of all the tarsi, brownish. Wings of a general 

 grayish hue; second basal cell subhyaline; the usual picture pale brownish; it consists: 1, 

 of the infuscated costal and first basal cells (except a small subhj-aline spot at the distal 

 end of the latter) ; 2, of a crossband not sharply limited by the intercalary vein, and rather 

 evanescent posteriorly, coalescing with the general grayish hu(; of the anal angle ; 3, of an 

 apical spot, separated from the crossband by an oblique, subhyaline streak between the end 

 of the stigma and the proximal end of the second submarginal cell ; posteriorly, a space of 

 a more grayish hue completes the lunule between the apical spot and the crossband. 



Malt. Face as in the female ; body altogether blackish, gray stripes on thorax hardly 

 visible; abdomen with a faint grayish pollen, and grayish golden hairs. Wings of an 

 almost uniform grayish-brown tinge, with only a faint outline of the usual picture ; a 

 distinct hyaline streak between the end of the stigma and the proximal end of the second 

 submarginal cell ; a double subhyaline spot at the distal end of the basal cells. 



Hah. Cambridge, Mass., midsummer ; New Rochelle, N. Y. ; Tarrytown, N. Y., in June ; 

 New Jersey. Six females and two males. 



I possess, moreover, two females and a male, which I collected in Florida, in March. The 

 females have the base of the first and second joints of the antennae yellowish-red ; in the 

 male, the antennas are altogether black ; otherwise I do not perceive any difference 

 between these specimens and those from the Northern States and take them for the same 

 species. 



In Wiedemann's description some clerical error was committed in the description of the 

 antennx!, as "yellowish antenme with a black basal joint," seem somewhat improbable in a 

 Chrysops ; moreover, Wiedemann himself describes the antennas of his C. fallginosus, $ , 

 as "black, with a brownish-yellow root," suggesting at the same time the synonymy of this 

 species with C. plangens, ? . 



I have never seen the following North American species of Chrysops : — 



1. Chrysops lugens Wiedemann, Dipt. Exot., p. 109 ; Auss. Zweifl., i, p. 212 (Savannah). 



For some time I felt inclined to identify this species with the dark specimens of C. morO' 

 sus, mentioned at the end of the description of that species. But Wiedemann describes his 

 species as "black" and not brown, which cannot possibly apply to the darkest specimens of 

 C morosus. 



2. Chrysops nigripss (Zetterstedt) ; Loew, Verh. Zool. Bot. Ges., Wien, 1858, p. 623. 



Occurs, according to Loew, in Lapland and also in Sitka (erroneously called (1. c.) "the 

 peninsula Sikka"). It belongs to the grouj) with an apical spot. 



