THE VELVET WATER-BUGS. 607 



KEY TO EASTERN SPECIES OF N^OGEUS. 



a. Apex of scutellum obtusely angled, not or very feebly notched or 

 bifid. 



b. Antennae slender, uniform pale brownish-yellow, joint 3 longer 



than either 4 or 5; elytra with a vague whitish spot on base of 

 clavus and a distinct whitish line near outer margin of basal 

 half of corium ; membrane with three vague whitish spots or none. 



582. CONCINNUS. 



bb. Antenna? stouter, joint 1 yellow, 2 — -5 darker, 3 and 5 subequal, 4 



shorter; elytra with a large white wedge-shaped spot on clavus, 



and a short vague yellowish line near outer margin of basal third 



of corium (fig. 151, b) ; membrane with four usually distinct 



white spots. 583. consolidus. 



o«. Apex of scutellum subtruncate, distinctly notched or bifid (fig. 152) ; 



membrane with four rather distinct pale spots ; joints 2 — 5 of 



antennas darker than 1, the latter one-half longer than 2. 



c. Elytra with a narrow white line on outer margin of clavus and a 



similar slightly longer one near outer margin of basal third of 

 corium (fig. 151, «); joints 1, 3 and 5 of antenna? subequal, 4 

 much shorter. 584. bilineatus. 



cc. Elytra with white markings on clavus and corium as in concinnus ; 

 joint 3 of antennae longer than either 4 or 5. 585. burmeisteri. 



582 (812). N^eogus concinnus (Uhler), 1894a, 221. 



Oblong, robust, minutely pubescent. Reddish- to fuscous-brown; 

 head, basal lobe of pronotum, scutellum and apical third of corium, usu- 

 ally darker than remainder of upper surface; under side of head, buc- 

 culae, beak and femora pale yellow, knees and tarsi lightly tinged with 

 fuscous; clavus in macropterous form with a vague milky-white spot 

 covering its basal half or less, exterior to this a longer narrow pale line 

 on corium ; membrane pale fuscous-brown with a vague yellowish spot 

 each side at base and sometimes three faint whitish ones on disk, viz., 

 an elongate one along the middle and a short oblique one each side of 

 this, these usually very faint or wanting. Joint 1 of antenna? feebly 

 curved, about one-half longer than 2, 3 — 5 very slender, thinly beset with 

 fine erect hairs, 3 longer than either 4 or 5, which are subequal. Prono- 

 tum with disk uneven, coarsely, sparsely irregularly punctate and with 

 an ill defined longitudinal median impression, its side margins distinctly 

 not deeply notched between the two lobes, humeral angles swollen, obtuse. 

 Elytra in macropterous form reaching tip of abdomen, in brachypterous 

 one without white markings and reaching only to its middle. Length, 

 2—2.3 mm. 



Frequent in the southern half of Indiana, April — November ; 

 Lake County only in the northern portion; doubtless occurs 

 throughout the State. Dunedin and R. P. Park, Fla., Dec. 3 — 

 April 17. Previously recorded only from Biscayne Bay in that 

 state. Geronimo, Guatemala {British Mus. Coll.). Occurs in 

 muck, masses of water weeds and beneath boards near ponds ; 



