114 NEW YORK STATE MUSEUM 



coast near Monterej', California. The Hies, of which there were 

 many, were resting- or running on the surface of the ocean water 

 of the tide pools, and had a tendency to gather in large numbers 

 in " patches " and " in ball like masses " on the surface of the 

 water. None were seen below the surface, nor were any seen 

 flying. They moved about on the surface of the water very 

 rapidly. The following is a description given by 1'rol'essor Kel- 

 logg, of the species: 



Eretmoptera browni Kellogg 



Biol. Bui. 82. 1900 



Male (fig.21). Length L' mm. Head slightly broader than the 

 thorax, eyes widely separated, very small, very convex, hairy, 

 and with rather large I'aeets; ocelli absent; antennae (fig.-i'j 

 short, length 3 mm.; six-segmented, the liasal segments wide and 

 globose, the sixth segment longest, the second next, the third and 

 fifth about equal, the fourth shortest, with a few short strong 

 hairs on each segment ; and the surface everywhere with a fine 

 stiff pubescence. The month parts are of simple Xemato- 

 cerous type, short, and with distinct labriim epipharyux, 

 maxillae, hypophar.Mix. and labinm: mandibles absent; labrum- 

 epiphannx Mig.l'.h short, broadly triangular, with obtusely 

 rounded tip. Maxillae with short, weak, tapering, pointed lobe, 

 and 4-segmented palpi, :> mm. long; the palpi with the last two 

 segments longest and equal, and all the segments provided like 

 the antennae with a few short si ray hairs and a fine stiff pubes- 

 cence (fig.16) ; hypopharynx (fig.lSi elongate, triangular, as long 

 as the labrum-epi pharynx, hut narrower and more acute; labium 

 (fig.17) short, lip-like, with free paraglossae, without pseudo- 

 tracheae. The face is whitish with a median longitudinal dark 

 line, and the anteunary fossae with dark margins; the basal 

 segment of the antenna is rather dark, the other segments pale. 

 Thorax without bristles, dark above, pale beneath. Legs long 

 and slender, whitish with blackish joints: middle and hind legs 

 longest and equal, front legs only a little shorter; average meas- 

 urement of middle leg. femur 1 mm., tibia 1 mm., tarsus 1 mm.; 

 tarsus 5-segmented. segment one as long as segment two, three 

 and four together; segment five slightly longer that segment four; 

 tibiae of all legs with a single apical spur; tarsal claws strongly 

 curved, thickened at base, with three delicate spines on basal half; 

 no pulvilli; empodium (fig.l.l emp.) rather long, curving, filiform, 

 and plumose or pectinate for its whole length. Wings narrow, 

 strap-like, extending only to fourth abdominal segment, length 

 .75 mm., and wholly without veins ; whitish, somewhat wrinkled, 



