AQUATIC INSECTS IN NEW YORK STATE 35D 
‘7 Thorax velvety black; legs reddish with black tarsi. Length 
1.5 to 2mm. Compare here also bracteatum (male), 
seme lecs-wholly. DrOwn.” <5. 2. c cc coe ce cece meridionale 
Thorax brownish black; legs usually pale; tip of tarsi not 
eee CIO EN LOM 2° tO AMT ie cys ects: 05% oie le, wwierd. ae pecuarum 
8 Thorax with silvery white pubescence; legs brownish black, 
covered with whitish hairs. A small variety ;(less than 
2mm long), from New Mexico has been named occiden- 
MEETS DCO) Vio) chcieyena.@ Statens &: o.0-e)e a\wie.ee/8 Sieve Sone o's meridionale 
Thorax with yellow hairs; legs reddish brown, covered with 
Mone, talt. tip of tarsi: blackish... 05... 0565s een taeet pecuarum 
Ne SRTE STO CU STIL TTONS Solo cic, 68 Ae eo <i avni's » © 01% 0:66 Bere, o.0i 0 dre 4, om ase e dae ore (10). 
EMEP SEVIS) SOMA TAUCK a) oc. 25) co3 ow 0 cla ee 0 ald ews 20min be de ee welne SA ae (20). 
10 “ Mesonotum wholly velvet black; gray spot on sides of the 
second, fifth, sixth, and seventh segments of abdomen. 
eeaIe EAMETS TAMIA ie 28 a cls, nie Ss) aancth cre Tabs G Wee's. che: ayane ue viet bracteatum 
Metanotum striped, or with grayish or metallic reflections......... (11): 
11 Dorsum of thorax with one or more longitudinal stripes........... (12) 
TLE SPILL WES TSIEN G os A Sa SRC fo re eee ee eee ree (14) 
12 Thorax with four longitudinal stripes; posterior margin 
white; abdomen black. Sex not given. Cuban species.... 
Ghibarc ory va € haa 
Se mea ECO) TINA TIGOG sy - a No.0 sc a hin Wiss wh ha wleiu te wiaiaitia clnveie eit oe ous) ope apa ee (13): 
13 Front and middle femora and tibiae wholly yellow; center of 
mesonotum with a black vitta, elsewhere gray. Length 
1omm. Colorado species .:.......... eRe ye are cis oie = Sve eae griseum 
Memort and tibiae wholly or partly brown... ...........6-<scsses (18a); 
18a ‘‘ Femora and front tibiae yellow, their apices brown; mid- 
dle tibiae brown, a yellow ring beyond the base, hind tibiae 
brown, the extreme base yellowish. Mesonotum marked 
with a narrow median and laterally with a very broad 
velvet black fascia.”” Length 3mm. New Mexico..... virgatum 
Front femora brown, tibiae brown on apical part................ (13b) 
' 18b Mesonotum with two narrow gray stripes (sometimes quite 
indistinct) on, a velvet black ground, in which there are ; 
SeatPered COMME NAITS .. .5.0. fis ec eine as ac aniees (iaGuts ah She fe vittatum 
“Mesonotum marked with a narrow median and slightly 
wider lateral black vittae.”” Length 2.5mm. Missouri..glaucum 
14 Anterior femora yellow. Mexican species... ....60.ceneceevennces (15) 
Ne TERE EESTOL ONTO, CULL CUS gx swe a, oe eau ete koa Ale soncdba Qik. @ orete w Mlae uipin e Seasecee } (17) 
15 Abdomen with the base of the second segment, and the sides 
of the third, fourth, and fifth yellowish white; tibiae fus- 
cous black with yellow bases. Length 4mm........mexicanum 
Renee Pe Lene yong re eee kG a ae eR eae ae wie a MG wie ad a am 8 pee (16) 
16 Metallic bluish black species; middle portion of fore tibiae, 
base of middie and hind tibiae, base of first and second 
joints of middle and hind tarsi, whitish. Length 2mm... 
metallicum 
Thorax fuscous and cinereous pollinose; the humeri pallid, 
fore coxae pale, middle and hind ones dark; femora pale at 
the base, black at the tip; tibiae black. Length 8mm..cinereum 
