TRANS. S. D. Society NATURAL HISTORY 
Family VELIIDAE 
195. Microvelia americana Uhler. Mussey’s, August, 1913. Taken 
from a small canyon pool among the hills. 
196. Rhagovelia obesa Uhler. Hurlburd’s Ranch, near Descanso, 
October. 
Family GERRIDAE 
197. Hygrotrechus orba Stal. Common everywhere on ponds and 
streams, March to October. I do not feel satisfied that I can 
distinguish this from remigis Say. 
Family SALDIDAE 
198. Pentacora signoreti Guer. March to May. Common on salt 
marshes along the coast and on the damp sands of San 
Diego river as far up as Lakeside. Young in March. 
199. Saldula interstitialis Say. Abundant everywhere in suita- 
ble places throughout the year. I have proposed Saldula to 
replace Acanthia of Reuter (not of Fabricius) with salta- 
toria Linn. as type. 
200. Micranthia pusilla n. sp. 
Size and much the aspect of humilis Say, but with broader 
elytra. Elytra deep black with two white costal spots and the 
membrane strongly distinguished. Length 3 mm. 
Head as in humilis, black, with a transverse white line at 
the base of the tylus. Antenne black, the joints subequal ; the first 
a little shorter, the second longer than the third and fourth. Ros- 
trum black. Pronotum broader posteriorly than in humilis, sides 
nearly straight, the humeral angles a little more rounded; hind 
margin broadly but shallowly excavated. Scutellum as long as 
broad, with a shallow transverse impression, and with the pro- 
notum opake, black and closely minutely sericeus pubescent. Ely- 
tra with a somewhat longer pubescence; deep black becoming vel- 
vety black toward the apex of the corium and on the tip of the 
clavus; corium with a square whitish spot resting on the costa and 
a double one close to the apex; usually there is a small white point 
on the middle of the corium, one at the inner apical angle and an- 
other near the tip of the clavus. Membrane strongly differenti- 
ated, whitish hyaline, a little enfumed, the nervures strong, brown; 
the areoles with a brown subapical mark and sometimes another 
near the base. Beneath and legs black, the knees, tibize except at 
base and apex and the tarsi, their tips excepted, pallid. In the 
female the apex of the abdomen and sometimes the slender hind 
margins of the ventral segments are pale. 
Described from three males and two females taken along the 
San Diego River at Lakeside, May 7th, 1913, and from a moist 
ravine at Alpine in June. Dr. J. C. Bradley also took this species 
at Sisson, Calif., in August, 1908. The species can be easily rec- 
ognized by its small size, intensely black color, the strongly distin- 
guished membrane and the four white marginal spots on the elytra. 
201. Joscytus politus Uhler. I took one example of the typical 
form of this species as described by Dr. Uhler by a pond in 
Rose Canyon near La Jolla, in September, 1913. In july, 
