THE GYMNOTID EELS OF TROPICAL AMERICA. 171 
viduals these were supplemented by large crustacea and small fishes. As this fish 
is known to frequent the weeds of the small open streams and trenches, it is prob- 
able, judging from the nature of its food, that it does most of its feeding at or near 
the surface. 
Higenmannia virescens (Valenciennes). 
Snout short and rather blunt; minute teeth in patches in both jaws; mouth 
small; not exceeding 300 mm. in length. 
In the twenty-three stomachs examined the bulk of the food was of two 
kinds, regardless of the size of the fish, namely Entomostraca and the larvee of 
insects. These two kinds of food exceeded all others not only in numbers but in 
bulk. The only kinds of food found in any amount were Hydrachnide and Anne- 
lida. All of the food is soft and small. The four classes of food are found distrib- 
uted throughout the table, but there is a grouping with regard to the size of the 
fish. Over one-half of the eighteen hundred and seventeen Entomostraca were 
taken from specimens under 200 mm. long, and more than one-half of the insect 
larvee from the specimens over 200 mm. The other kinds of food were also found 
in the stomachs of specimens over 200 mm. long. The young fish are restricted 
to entomostraca more than the adults. The insect larvee were for the most part 
small Diptera, and the Annelida represented a small soft form resembling T'ubifex. 
(3) Higenmannia macrops (Boulenger). 
Snout short, truncated; teeth minute; in patches in both jaws; mouth quite 
small; size small, not exceeding 200 mm. 
; | 
No. Locality. Bee ee eee al, ates |aeaaee 
i IRGCKStONe rete ee ae or 175 44 Sina leB aera nc, sho we 1 
2 AhiiieAth.5 a anenDe 172 l¢/ 30 
oo umatumani......... 170 9 122 
Ame QUI GUMATIe ace ele 6: 165 40 109 | 
Bueiockstone.s.....-,.-- 160 4 | ema Oe ie miele cies Eee 3 
GiemalRockstones aris te 160 23 | 22 
7 IRockstones.........-+ 155 | 42 72 | 
8 ROcKStOnes. sss .. <1. 150 | 4 40 RE SSS cay = 
9 |Rockstone........... 148 1 DSC alltcosen eee | see iaeeranto 3 
Oe] Crabeballsaes sc aes in<- 144 16 34 | Ge wom Ree ore te 1 
11 |Rockstone. SOO 140 44 loceqascooGnaliseeosoondde Iss, eee ete 1 
12 [Rockstone...........| 140 7 sao padendnalntoe cleans) 
133 IRO@KON545 bene onS 135 2 Bel i ezetorscoysnete ee [Pave aes ot Pe e 1 
14 @rapphallsperr seis ce 135 1 Atom eae here = 
15 \CrabPalls........... | 130 SU We E2749. Goats al ee | + 5 
“TRO eaten 5 ORS ocean 284 495 | ae el eee 15 
Only adult specimens of this species were examined, so no comparison of the 
food and the size of the fish could be made. The food of this small species seemed 
much the same as that of specimens of HZ. virescens of the same size. Entomostraca 
and insect larvee formed the bulk of it. 
