HUNGERFORD: AQUATIC HEMIPTERA. 131 



coxje; antennse moderately long, brownish, finely pubescent, the basal 

 joint yellow at base, much longer than the third, which is also much 

 longer than the second, the fourth about as long as the second, thick, 

 distended in the middle. Pronotum very moderately convex behind the 

 middle, sloping posteriorly; the anterior lobe short, collar-like, with 

 oblique sides, a yellow spot on the middle, and feebly carinate lateral 

 margins, it is separated from the posterior lobe by a deeply incised line; 

 the posterior lobe is somewhat abruptly wider, with strongly reflexed 

 lateral margins and subacute humeral angles, with the posterior margin 

 abruptly deflexed; a broad segment behind this has in the depressed 

 outer corner a tumid callosity which occupies the position of the wing- 

 pad. The propleural flap is mostly yellow, as is the cap of the inter- 

 mediate, and posterior coxte and also coxae, trochanters, base of anterior 

 femora, and the immediate base of posterior femora; other parts of legs 

 fuscous, sericeous pubescent, and the posterior femora unarmed. The 

 posterior border of last ventral segment and sometimes the genital seg- 

 ment yellow. 



"Length to end of abdomen, male, 2% ; female, 3^A mm. Width of pro- 

 notum, male, 1 ; female, 1 M mm. 



"This is a common species on the surface of salt water around the in- 

 lets of the Florida Keys. Several specimens were secured in the Bay 

 of St. George's, on the leeward side of Grenada, September 6, on the 

 surface of the sea. Only specimens taken in copula were kept. 



"Others were captured at the southern end of the island of St. Vincent, 

 May 24, swimming on the sea, in a sheltered and still place near the 

 shore. Gregarious in habits, 50 to 60 together. They were also taken 

 in copula at this time. 



"The male is very much smaller than the female, and the latter is 

 usually marked by a carinate line on the middle of the contact of the 

 two lobes of the pronotum." 



From Florida now, as well. 



Genus VELIA Latr. 1804. 



The largest bugs of the family belong here. The tarsi are 3-seg- 

 mented all around, and the middle tarsi are not cleft. Dimorphism as to 

 wings occurs. Ocelli are absent. Four species for our range. 



KEY TO VELIA. 



A. Intermediate tarsi much longer than the posterior tarsi; segment 

 2 much longer than 3; segment 2 of hind tarsi shorter than 3. 



V. australis Bueno. 

 AA. Intermediate tarsi little longer (if any) than the posterior tarsi. 

 B. Intermediate tarsi, with segments 2 and 3 subequal. 



V. stagyialis Bueno. 

 BB. Intermediate tarsi, with segment 2 longer than 3. 



C. Antennae, with segment 1 one-half longer than 2; legs 

 rather short; 5th ventral segment not produced in male. 



V. brachialis Stal. 

 CC. Antennae, with segment 1 nearly twice as long as 2; legs 

 long; 5th ventral segment produced in the male. 



V. annulipes Champ. 



