22 University of MicJiigan 



Port-of-Spain and at streams crossed by the railroad from 

 Port-of-Spain eastward to Sangre Grande. This railroad 

 from Port-of-Spain runs nearly directly east, and not far 

 south of the hills, to Arima, en route crossing several tribu- 

 taries of the Caroni River. From Arima the railroad runs 

 in a southerly direction for a few miles and then turns east 

 again, which is its general direction to its terminus at Sangre 

 Grande. From Arima to Sangre Grande it is far south of 

 the range of hills which it skirts near Port-of-Spain, and the 

 streams at Arima and eastward are correspondingly slower 

 flowing. West of Arima within one mile are two small, grav- 

 elly streams, where we collected on March 4, 1912. 



The streams at Arima, like the other streams east of Arima 

 where we collected, yielded only Hetaerina caja. Three males 

 and seven females were collected, indicating that we were not 

 at the habitat where the species was most numerous and active. 

 5. Aroa, Venezuela. A terminus of the railroad, about 86 

 kilometers above Tucacas. Elevation, 700 feet. The sandy 

 Aroa Valley here is dry, and the native flora is largely 

 destroyed. Many of the surounding hills have been burned 

 over. At a greater distance from town are some fine rocky 

 quebradas which rise high in the mountains and which dis- 

 appear in the sand a short distance after their emergence from 

 the hills. One of these is west of town, possibly two miles 

 in an air line. It is two to ten feet wide, with waterfalls and 

 deep pools and dense growths of Cyclanthus. About two miles 

 west of this quebrada is another slightly larger and slower 

 one. There is another quebrada at the Tichara mine, but it 

 is rock-scoured, sun-exposed, and absolutely no good. Col- 

 lected March 12-14, 1920. 



On March 12 we collected up the quebrada two miles west 

 of town and during the day took only one species, Hetaerina 



