A Collecting Trip to Colombia 15 



with its water supply. Near where the trail leading from town to the intake 

 joined the river there was a large waterfall. Above this fall the San Juan 

 was a fine rocky stream five to ten feet wide with rapid drop and with 

 some high waterfalls. The sides of the valley through which it flows were 

 high and rough and wooded with tall trees and bamboos, four to five inches 

 in diameter, beneath which grew many Heliconias and some aquatic plants. 

 Below the waterfall to its mouth in the Cuamo, it was a beautiful rapid 

 stream six to fifteen feet wide, with some cliffs and generally high banks, 

 but with no falls. The Cuamo carried about three or four times as 

 much water as the San Juan, and, where we explored it for a short distance 

 above the mouth of the San Juan, it was similar in character to the lower 

 San Juan. It was one of the most beautiful rivers I have ever seen. 



About three kilometers south of town the railroad crossed a very small 

 stream which, when we were there, had almost ceased to flow. This we 

 followed to its mouth in the Poquera. The Poquera was about five to fifteen 

 feet wide and had a wide, relatively shallow, rocky and sandy bed. It is 

 said to become nearly dry in the dry season. 



As might be expected, species of Argia and Hetaerina were the con- 

 spicuous dragonflies where we collected about Maraquita. Along the upper 

 San Juan we saw for the first time specimens of a new Thorine genus, 

 Miocora, since described by Dr. Calvert from a Costa Rican male. Near the 

 same place we took a female of an undescribed Erpetogomphus, a genus 

 hitherto not known south of Costa Rica. On the same stretch of river we 

 saw Heteragrions for the first time since leaving the Canal Zone, and Al- 

 lopodagrion, previously taken at Cincinnati near Santa Marta, was common. 

 Along the Poquera and its small tributary we found a small protoneurine, a 

 much more inconspicuous insect than the notoriously inconspicuous 

 Psaironcura rcmissa. Along the bank of the lower San Juan, near the wa- 

 ter's edge, where a yellowish seepage formed a little swampy spot about 

 one foot wide and six feet long, we took several specimens of a small Argia 

 which was seen nowhere else. Damp places about the taps of the water pipes 

 in the town were frequented during the day by the tropically omnipresent 

 Orthcmis ferniginca and after svmdown by a few Gynacanthas. The weather 

 at Maraquita was not the most favorable for collecting as generally it was 

 very cloudy until about ten a. m.; and during the rest of the day the sun 

 usually shone through a haze. A light rain fell during the night of Feb- 

 ruary 5. 



On February 6 we took train from Maraquita and returned to La 

 Dorado. Our collection now numbered 126 species and 6,097 specimens. 



Among the five river steamers tied up at La Dorado we found the 

 General Cordoba, on which we had travelled from El Banco to La Dorado, 

 and we at once engaged passage to Puerto Berrio. We left La Dorado 

 about five a. m., February 7, and reached Puerto Berrio about ten a. m., 

 February 8, having been delayed by a smashed wheel and stranded on a 

 sand bar. The remaining hours of the day were spent along the same stream 

 where we collected January 31. At some small grassy marshes along the 

 railroad grade, enroute to this stream, we saw Coryphocschna vircns, a 



