April, 1920] Water-Striders New To Ohio 207' 



Microvelia borealis Bueno. 



This species is found throughout the state, both apterous 

 and macropterous individuals being quite common. Specimens 

 are at hand from Cleveland, Berea, Wooster, Tiffin, Buckeye 

 Lake, Prentiss, Hebron, Columbus (Mirror Lake and numerous 

 small ponds in the vicinity of Columbus), Sugar Grove, and 

 Rockbridge. It is usually a little larger than M. huenoi^ or 

 M. hinei (new species described below) and the hind tibial are dis- 

 tinctly curved in the male. 



Microvelia hinei new species. 



Winged Form. General color velvety black or dark brownish 

 black, the hemelytra with white area in the cells. Head a little longer 

 than wide, with an impressed median, longitudinal line and with two 

 more or less distinct broad, reddish brown marks (one on each side of 

 impressed median line) on the basal portion; eyes prominent, the 

 distance between them greater than their diameters; head with silvery 

 gray pile next to the eyes. Antenna slender, rather short, not reaching 

 to the posterior margin of pronotum; first segment strongest, curved, 

 subequal in length to the third ; second segment shortest ; third segment 

 slenderest; fourth segment longest, about two and a half times the 

 length of the first, at its widest part about equal to the second in 

 thickness, fusiform. Antennas and legs dark brown, the coxae, trochan- 

 ters, basal portion of femora and usually a rather large area on first 

 antennal segment flavous. Elytra brownish black, the cells with 

 white areas, the outer margins hairy. Pronottmi a little wider than 

 long, with a broad, transverse, finger-like flavous line near the anterior- 

 margin, with two transverse rows of foveas (one on each side of flavous 

 line), usually with a broad, dark, median streak; humeral angles tumid, 

 rather prominent, the lateral margin reddish brown. Abdomen beneath 

 blueish gray. Femora practically straight in both sexes. 



Male a little shorter and more slender than female. Genital segments- 

 not prominent, usually retracted within the abdomen; first genital 

 segment very broadly, deeply and roundly notched beneath, the 

 posterior margin above nearly straight. Length, (male) 1.6 mm., 

 (female), 1.65 mm.; width, (male), .6 mm., (female), .65 mm. 



Apterous Form: Smaller than the winged form and usually 

 considerably lighter in color. Thorax with two segments visible above, 

 the prothorax longest and the posterior margin concave. Connexivumi 

 rather broad, light yellowish brown, the outer margin and narrow 

 border between segments dark brown. Body beneath flavous or 

 brownish, the pile silvery gray. Thorax dark brown, usually con- 

 spicuously marked with' flavous or reddish brown, a broad transverse 

 line near the anterior margin of the prothorax and a broken median 

 line (usually to the second abdominal segment) flavous. The last two^ 



§ Drake, Carl J., Bui. Brookl. Ent. Soc, Vol. XV, pp. 19-21, \?,2Q. 



