hungerford: aquatic hemiptera. 129 



equal to the third, the fourth decidedly shorter than the third. Thorax 

 obese, the pronotum velvety blackish, sparingly clothed about the sides 

 with fine golden pubescence; collum with an orange band which is in- 

 terrupted in the middle; middle line faintly carinated; the tip of pro- 

 notum produced at tip, curved upwards, its extreme end expanded, emar- 

 ginated, and each process granulated; the humeri prominent in the 

 winged individuals, in the unwinged it is obliquely rounded. Pectus 

 bluish, sericeous, each side of prosternum broadly orange. Coxae, tro- 

 chanters, and usually the base of femora, yellow; the femora bronzed or 

 bluish-black, minutely hoary pubescent; the tibiae and tarsi duller black; 

 posterior femora of the males stouter than of the females, in both with a 

 yellow, black-tipped, curved spur beyond the middle, and from it to near 

 the tip series of minute teeth. Abdomen moderately compressed (very 

 strongly compressed in the unwanged females), minutely sericeous, 

 pubescent, excepting on the middle of tergum, which is bald, shining 

 black; the raised upper edge of the connexivum orange, in the female its 

 posterior tips produced into long slender spines. The middle of the ante- 

 genital ventral segment of the male quadrately, broadly flattened, each 

 side of which a little elevated. Basal genital segment of the female 

 broadly black on the middle. The cerci of the male are long, slender, 

 curved, hairy processes. Length, 3V^ to 4 mm. Breadth of pronotum, 

 1% mm." 



Localities, taken from Van Duzee : Ontario, Maine, Massachusetts, 

 Vermont, New York, New Jersey, Pennsylvania, Maryland, District of 

 Columbia, Virginia, North Carolina, Florida, South Carolina, Ohio, 

 Michigan, Tennessee, Utah, and California. 



Rhagovelia distincta Champ. 



Champion. Biol. Centr. Am., II, p. 1.35. 



"Winged form. Moderately elongate, black, the legs with a green or 

 bluish-green lustre, the pronotum with a narrow transverse fulvous mark 

 on each side of the disc in front, the base of the antennae, the prosternum, 

 the cox£e and trochanters entirely or in part, the base of the anterior 

 femora, the connexival margins, and in the males the terminal ventral 

 segment in the middle and the underside of the first genital segment, 

 more or less flavous; the pleura and under surface bluish-grey; the body, 

 legs, and antennae very finely pubescent, and also clothed (the two apical 

 joints of the antennse excepted) with long scattered setae, the pronotum 

 usually with a transverse patch of greyish or silvery pubescence on each 

 side in front. Head with a smooth impressed median line; antennae 

 moderately long, joint 1 about one-half longer than 2, 2 and 3 equal in 

 length, 4 shorter than 3, stout, fusiform. Pronotum with a distinct 

 median ridge, and produced behind into a spiniform process, the surface 

 sparsely and finely punctured. Legs long and rather slender, the hind 

 tibiae with a very short, indistinct tooth at the apex; intermediate tarsi 

 with joints 2 and 3 subequal in length. 



"Male. Anterior tibije dilated in their apical half; posterior femora 

 moderately incrassate, armed on the inner side with a long, partly flavous, 

 tooth at about one-third from the base, and with a row of short teeth 

 extending thence to the apex (in some of the well-developed apterous 

 examples also closely and finely denticulate along the basal third) ; 

 posterior tibiae finely denticulate and slightly sinuous within. Pronotal 

 spine short. Sixth ventral segment broadly flattened along the middle 

 and feebly arcuate-emarginate at the apex. 



"Female. Posterior femora not stouter than the intermediate femora, 

 armed with a very long, acute, blackish tooth at about the middle, and 

 very finely denticulate thence to the apex; posterior tibise straight, ob- 



9 — Sci. Bui. — 1669 



