THE WATER TREADERS. 615 



2. Elytra wanting. Connexivum strongly reflexed. Front femur and 

 tibia subequal in length; hind tibia one-third longer than hind femur. 

 Male with a fringe of short spines on the front margins of the ventrals. 

 Length, 1.8—2.2 mm. 



Douglas Lake, Mich., July 31 {Hunger ford) . Known only 

 from that lake. In his biological notes Hungerf ord says : 



"The habits of this species are much as I have recorded them for 

 Mesovelia mulsanti White. It seems, however, to live in much more 

 sheltered and inaccessible places, preferring the dark and shadowy wa- 

 ters beneath the dense growth of Chamsedaphne to the sun-lit haunts of 

 its well known relative. In the pairs that I have observed mating in 

 captivity, the males have been supported very curiously above the female 

 by the genital clasp alone — all of the legs poised in mid-air. They have 

 remained in copula for thirty minutes and longer. The females place 

 their eggs in the tissues of plants after the manner of M. mulsanti. The 

 first I found were in the petiole of a black water-soaked dead leaf of 

 Andromedra glaucophylla Link." 



591 ( — ). Mesovelia cryptophila Hungerford, 1925, 454. 



Elongate, subcylindrical, the pronotum relatively broad and abdomen, 

 especially that of male, slender. General color olive-green, rather thickly 

 and finely pubescent; color of head as in key; pronotum dull brown, a 

 median spot and an ill defined band across hind margin olive-green; meso- 

 notum olive-green with brownish blotches; metanotum dark in front, 

 paler behind; beneath with dark reddish-brown stripe on pleura; beak, 

 legs and ventrals whitish tinged with pale green. Antennas fuscous, joint 

 1 slightly more than one-fourth longer than 2, 3 and 4 subequal, each 

 twice the length of 2. Interocular area half as wide as head across eyes. 

 Pronotum cylindrical, joint 2 of hind tarsi more slender and longer than 



3. Length, 2.1—2.8 mm. 



Douglas Lake region, Mich., July 26 (Barber) . Known only 

 from a small bog where Hungerford found them in numbers on 

 the water amidst a thick growth of floating leather-leaf, 

 Chamccdapncr calyculata (L.) . Only the apterous form was found. 



592 ( — ). Mesovelia amcena Uhler, 1894a, 218. 



Elongate, oblong. Head dull yellow; tylus, base of cheeks and two 

 stripes on vertex piceous-brown ; pronotum and scutellum dark brown, 

 the former with a vague transverse yellowish spot behind front margin; 

 elytra in great part hyaline, the veins and apex of corium brown; mem- 

 brane whitish-hyaline, the apical third or more with a fuscous blotch, this 

 bisected by a median pale line; beak and legs yellowish-white, the tibiae 

 and tarsi tinged with fuscous ; sterna pale brown with a leaden bloom ; 

 ventrals pale dull yellow, their sides darker. Antenna? pale brown, joint 

 1 slightly stouter and one-third longer than 2 ; 3 and 4 very slender, sub- 

 equal, each about one-half longer than 1 and 2 united. Head with a nar- 

 row impressed line between the brown stripes. Pronotum with basal two- 



