SCATELLA. 171 



lying beyond the posterior transverse vein is entirely wanting, and 

 the remaining are rather indistinct ; the second segment of the 

 costa is at least four times as long as the third; the third and fourth 

 longitudinal veins are parallel towards their ends. 

 Hub. Middle States. (Osten-Sacken.) 



2. S. lllgeiis LOEW. and J> . Nigra ; alse iiigricantes, guttis hyali- 

 nis quinque in disco duabusque obsoletioribus in apice pictse. 



Black ; wings blackish with five clear drops in the middle and two more 

 indistinct ones towards the tip. Long. corp. 0.11. Long. al. 0.13. 



It differs from the European ^ca^. stagnalis only by somewhat 

 more acute wings, its somewhat less convex face, and the stripes 

 of the thorax being a little more distinct ; perhaps on examining 

 a larger number of specimens it may prove to be only a variety 

 of it. Black ; face with brownish-gray dust, rather convex, only 

 a little impressed beneath each antenna, hairy and bristled, with 

 distinct black cilia on the border of the mouth. Antennae black ; 

 the bristle with an excessively short, but yet distinct pubescence. 

 Cheeks exceedingly narrow. Front dusted with grayish-brown, 

 the spot on the middle of it a little glittering. Upper side of the 

 thorax likewise dusted with brown, but not without all gloss, with 

 two distinct whitish-gray longitudinal stripes, but little distant 

 from each other and beginning on the anterior border, but not 

 reaching nearly to the posterior border ; besides there are two 

 short lateral stripes of the same color, beginning at the shoulder- 

 corner. Scutellum of the color of the upper side of the thorax, 

 only a little more glossy. Abdomen black, rather glossy towards 

 the end : the fifth abdominal segment of the male is almost twice 

 as long as the fourth. Legs entirely black. Wings clouded with 

 black, having five glassy drops on the middle, in the usual position ; 

 besides there is an obsolete spot, forming an indistinct clear drop 

 near the border of the wing between the tip of the second and 

 third longitudinal veins, and another still less perceptible spot in 

 the cloudy color beyond the tip of the third longitudinal vein. 



Hob. Middle States. (Osten-Sacken). 



