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 6V4 mm.; breadth (of the pronotum), 1% to 2 mm. 



"Localities: Arizona (Neotropical). 



"A fifth has been added recently, and the description is appended: 



Velia watsoni Drake. 



Drake, Florida Buggist, June, 1919. 



"Head formed as in V stagnalis Burmeister, the smooth impressed 

 median line quite distinct. Eyes globose, strongly faceted. Antennae 

 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 tibi« denticulate; length 

 of tarsi and tarsal segment proportioned about the same as in stagnalis. 

 Antennse, 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. Antennje pale 

 brovvm 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 antennae. The first antennal segment in V. watsoni is 

 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 Veliid^. 

 General Note^. 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 



