90 Bulletin of the Brooklyn Entomological Society Vol. XVI 



therefore the matter must be called to the attention of students. 

 The rather numerous species of Microvelia, long neglected on 

 account of their minute size and the deceptively immature appear- 

 ance of the apterous adults, are now being rapidly made known, 

 and it is becoming clear that they all have a wide distribution, at 

 least in the region east of the Mississippi River. During June of 

 the present year I met with two species recently described by 

 Drake, M. buenoi (An undescribed water-strider from the Adi- 

 rondacks. Bull. Brooklyn Ent. Soc, XV: 19-21, 1920) and 

 M. hinei (Water-striders new to Ohio. Ohio Jour. Sci., XX: 

 207, 1920), living in company with M. albonotata on a small 

 campus pond at Northampton, Massachusetts. These appeared 

 only in the apterous form, but I have since taken both apterous 

 and winged phases of hinei at Cold Spring Harbor, Long Island, 

 N. Y. The species last mentioned is remarkable for its beautiful 

 coloration and extremely small size; in fact, I think it is the 

 smallest known Microvelia. The following descriptive notes are 

 presented to supplement the original description. 

 Microvelia hinei Drake. Fig. i. 



Wingless form. — Second, third, and fourth abdominal seg- 

 ments with narrow median yellow stripe, bluish laterally; 

 fifth black, with median stripe ; sixth and seventh bluish or 

 yellowish, the median line narrowly black or brown, polished. 

 In the darkest specimens the dorsal markings become very 

 obscure. 



Median impressed line of head not glabrous ; antennae 

 longer than head and thorax together on median line (2y- 

 25) ; first segment (7) stout, second (5) almost as thick as 

 first, clavate, third (8) half as thick as second, almost linear, 

 fourth (12) somewhat thicker than third, very slenderly fusi- 

 form, slightly shorter than distance between eyes (12-13) ; 

 rostrum extending to front coxae. Thorax short, nearly 

 three times as wide as long on median dorsal line ; pronotum 

 four times as wide as long, with a transverse curved row of 

 punctures near anterior margin and one behind middle. 

 Mesonotum visible, more than one-half as long as pronotum 

 on median line, posterior margin nearly straight across mid- 

 dle. Metanotal triangles each about one-third as long as 

 width of mesonotum. First and second abdominal segments 

 about equal in length, third to sixth about equal, each slightly 

 shorter than second, seventh longest, but shorter than broad. 



