WATER-STRIDERS, STRIDULIVELIA—DRAKE AND MENKE 417 
City. We have many apterous and macropterous specimens of both 
sexes from Panama, Costa Rica (Punta Arenas), Guatemala (Jutiapa), 
and Mexico (Puebla, Alvarado, and Guadalajara), all taken near the 
water’s edge in the flowing parts of streams. The whitish testaceous 
color of the terminal antennal segment in both sexes, the distinct 
male parameres, and the unusually large spines on the hind trochanter 
of the male distinguishes this species from its congeners. 
Velia epeixis Drake and Menke, new species 
PuLatsEs 2, 3,c 
BRACHYPTEROUS FORM: Moderately large, slender, chocolate brown, 
with a large patch of appressed silvery hairs in each anterolateral 
angle of the pronotum, the pronotum margined on both sides and 
behind with brown; head brown, with the median longitudinal stripe 
divided by an impressed median line; body beneath brownish tes- 
taceous, with thoracic sterna dark chocolate and pleura with a bluish 
luster; pronotal pits with short silvery hairs; legs brownish testaceous, 
with hind femora more or less distinctly banded beyond the middle 
with dark fuscous; stridulatory organs absent. Length: 5.00 mm., 
width: (across humeri) 1.55 mm. 
Head with the usual impressed median line and basal marks; beak 
extending to middle of mesosternum; antenna shortly pilose; segmental 
measurements: I, 1.00 mm.; IJ, 0.78 mm.; III, 0.65 mm.; IV, 0.52 
mm.; pronotum coarsely punctate, rounded behind, with median 
carina moderately distinct; wing pads small, covered wih appressed 
silvery hairs; sides of thorax and abdomen with numerous sharply 
and deeply sculptured sulci (pl. 2); labial sulcus with a deep narrow 
furrow on mesosternum; metasternal omphalium large, tumid, rather 
sharply subangulately rounded behind; metathoracic scent glands 
with opening concealed under median part of posterior ledge of ompha- 
lium; ostiolar sulcus (one on each side) Jeading from the ostiole 
(under hind margin of omphalium) anteriorly in a groove on each 
side of the omphalium and then upwards in front of the metathoracic 
acetabulum, with a small tuft of brown hairs at apex of channel 
@l. 2;a,b). 
Abdominal sterna IJ and III distinctly carinate on median longi- 
tudinal line; pleura II and III each with a median vertical furrow on 
both sides; connexivum produced backwards into a long sharp spine, 
which is a little longer in male than female; first male genital segment 
only moderately transversely concave beneath, parameres as in 
plate 3,c; legs moderately slender; femora a little stouter in male than 
in female; foretibia with short apical comb in both sexes; middle legs 
very long, tarsal segment IT longer than IIT (50: 45), tibia beneath 
