134 THE UNIVERSITY SCIENCE BULLETIN. 
long and slender, joint 1 stouter than, and nearly twice as long as 2, 
2 and 3 subequal in length (4 broken off). Pronotum longitudinally 
carinate in the middle anteriorly, distinctly punctured, rounded behind ~ 
and with a rather deep transverse groove in front; the propleura ex- — 
tending inwards, and partly separating the anterior from the posterior — 
lobe. Meso- and metapleura laterally prominent. Legs long and rather ~ 
stout; the femora of equal thickness, the hind pair obsoletely denticulate 
along their inner edge; the intermediate tarsi with joint 2 longer than 
3. Fifth ventral segment broadly produced in the middle behind; the © 
sixth segment very feeble emarginate, with the apical margin thickened. 
Genital segments very prominent. 
“Length, 5 to 644 mm.; breadth (of the pronotum), 1% to 2 mm. 
“Localities: Arizona (Neotropical). 
“A fifth has been added recently, and the description is appended: 
Velia watsont Drake. 
Drake, Florida Buggist, June, 1919. 
“Head formed as in V. stagnalis Burmeister, the smooth impressed 
median line quite distinct. Eyes globose, strongly faceted. Antenne 
long and slender; basal segment curved much stronger, also two-sevenths 
longer than the second; the second a little stronger than the third; the © 
second, third and fourth about equal in length. Pronotum very coarsely 
punctured longitudinally carinate in the middle, produced and rather 
narrowly rounded posteriorly, the tubercles large and prominent. Meta- 
pleura with the upward projecting spines visible from above located, as 
in stagnalis, about the middle. First and second abdominal segments — 
(dorsal surface) with a lateral carina on each side. Legs long and — 
rather stout, the under surface of femora and tibize denticulate; length 
of tarsi and tarsal segment proportioned about the same as in stagnalis. — 
Antenne, legs and body pilose and setigerous, the hairs along the pos- 
terior margin of the pronotum becoming rather long. Length, male 
4.2 mm., and female 4.1 mm.; width, male about 1 mm., and female — 
1.12 mm. 
“Color: general color dark or blackish brown. Legs pale luteous, the 
bands varying from light brown to fuscous. Eyes black. Antenne pale 
brown to brown. Pronotum brown, the posterior portion becoming yel- 
lowish brown in the female. Abdomen dark brown, the venter blackish; 
connexivum (male) with a yellowish brown spot on the anterior portions © 
of each of the last three abdominal segments and the entire connexivum 
lighter with more prominent markings in the female. . 
“Described from numerous specimens, collected during the summer | 
of 1918 near Gainesville, Florida. Type and Allotype in my collection. 
Paratypes in the Florida Experiment Station, Museum of the University 
of Florida and my collection. 
“The eggs are deposited on floating aquatic plants and floating sticks — 
or wood just beneath the surface of the water. The species is predaceous 
and lives in stagnant water. : 
“The macropterous form is unknown. The insect very closely re- 
sembles Velia stagnalis Burm., from which it may be distinguished by 
its darker color, the much more prominent tubercles in the pronotum and 
the much longer antenne. The first antennal segment in V. watsoni i 
much longer than the first antennal segment in V. stagnalis, the first 
segment in the latter and the second segment in the former being equal 
in length.” 
B. BioLoGy OF VELIIDA. 
General Notes. These bugs are for the most part gregarious. Some 
of them are content to dwell on some small mud puddle and others prefer 
the rapid waters. All are predatory. Bueno has given us a paper on 
