1865.] 233 



parallel and very well denned; it is slightly capillary on its posterior portion, 

 near the scutellum only; beyond the suture, the thorax, including the scutellum 

 and metanotum, are covered with a dense gray bloom ; pleurae brownish-yellow, 

 with a cinereous bloom. Abdomen reddish-brown. Coxae yellow; feet brown- 

 ish tawny; tips of the tibiae and the tarsi, except the basis of the first joint, 

 brown. Wings hyaline; costal veins yellowish-tawny, the other veins brown; 

 the tip of the auxiliary vein is almost exactly opposite the origin of the second 

 vein: section of the second vein, posterior to the small cross-vein, arcuated; 

 the great cross-vein is at the very basis of the discal cell : the inner diseal 

 cross-vein is very oblique : no vestige of a stigma. 



Hal). — New Jersey, in July, (Cresson) ; a male and a female speci- 

 men. 



Observation. — It is not impossible that the female of Limnobiorh/n- 

 chm braziliensis Westw. is identical with our species, the male, as we 

 have shown above, probably belonging to a different genus. West- 

 wood's description (compare it above) is, however, too short to admit 

 of identification. 



2. T. muliebris, n. sp. % . — Obscure cinerea, fronte latiore, vittis thoracis ob- 

 scuris, pedibus pallidis, alis immaculatis. 



Dark cinereous, front rather broad, stripes of the thorax blackish, feet pale 

 tawny, wings immaculate. 



Long. corp. 0.3. 



Head blackish or dark gray ; occiput and occipital orbits cinereous ; antennae 

 brownish; basal joints darker ; proboscis pale brown. Thorax blackish gray ; the 

 usual three stripes are still darker, almost black ; they occupy the greater part 

 of the mesonotum; the latter shows, especially on the sides, a yellowish bloom; 

 metanotum blackish, with a gray bloom. Feet, including the coxae, yellowish ; 

 tarsi infuscated from the tip of the first joint. Abdomen blackish; forceps of 

 the male reddish-yellow. Wings hyaline; no vestige of a stigma; costal and 

 first longitudinal veins tawny, the other veins darker brown ; the tip of the aux- 

 iliary vein is very slightly beyond the origin of the second vein ; the section of 

 the second vein, posterior to the small cross-vein, is strongly arcuated: the 

 inner discal cross-vein is very oblique ; the great cross-vein is a little before 

 the discal cell. 



Hab. — -Princeton, Mass. (Scudder) ; a single male specimen. 

 Observation. — This species is distinguished from the preceding by 

 its much smaller size, its darker and more gray coloring, and its com- 

 paratively broader front. Whether the position of the great cross-vein, 

 which in T. muliebris is before the discal cell, is also to be reckoned 

 among the constant characters of the species, is uncertain, as I have 

 but a single specimen. The joints of the flagellum of this species im- 

 mediately following the stout basal joint, are very short and crowded 

 together; they are more elongated in T. magna. The color of the only 

 specimen in my possession is somewhat injured by moisture, especially 

 about the head. 



