THE AMERICAN TETRAGONOPTERINAE. 173 
Scales not more than 36. 
ce. Dorsal black or with a well-defined black spot. (See also melanopleura). 
d. Humeral spot present, anal unmarked with black or with black only on the tips of the rays. 
e. Dorsal black, a deep humeral spot, last five anal rays and distal two fifths of remaining 
anal rays black. D.11; A. 27 to 30; scales 6 to 7.5-31 to 33-3.5. Maxillary with two 
(ITELCOTSTOVG LTR SCCUIL ANS herd ie Ie ee ae oe 3. callistus (Boulenger). 
ee. Basal part of dorsal not black. 
f. Maxillary with two or three teeth; inner row of premaxillary of five teeth. 
g. Maxillary teeth tricuspid; last few and frequently the first few anal rays with black 
on or near the tips. 
h. Humeral spot very small, black on anal subtended with white; depth 3.8; head at 
base of occipital process 1.33 in. the greatest depth; D. 11; A. 26; scales 5-32 to 
BEI B)y Ao Roma Oe OC eS EE oe eS eee ey erm 4. minor Durbin. 
hh. Humeral spot vertically elongate, anal rays often tipped with black; depth 2.75; 
head at the base of occipital process 1.5 in the greatest depth; D. 11; A. 25-27; 
S@AGS GPU RBIS Pie ote ae ee ee ee Oe ee, 5. serpae Durbin. 
gg- Maxillary teeth with 6 to 8 cusps, broad, set: obliquely, overlapping; anal usually not 
black tipped. D.11; A. 28; scales 5 to 7-24 to 27-3.5.....6. copelandi Durbin. 
ff. Maxillary with about six, tricuspid or conical teeth; eight tricuspid teeth in the inner 
row of the premaxillary; base of caudal hyaline; lower fins dusky, ventrals sometimes 
reaching the fifth anal ray. D.11; A. 27 to 30; scales about 30 to 33 
7. bentost Durbin. 
dd. No humeral or caudal spot. 
t. The black dorsal spot margined with white above. Maxillary with four to six 
tricuspid or conical teeth. D. 11; A. 26 or 27; scales 5-31 to 33-3. 
8. rosaceus Durbin. 
it. Maxillary without teeth; D. 11; A. 22; scales 5-34-3..... 9. hasemani Fowler. 
cc. Dorsal plain. 
j. No humeral spot. 
k. Caudal spot lacking or faint; premaxillary with five teeth in the inner row 
l. Fourteen scales in a vertical series; caudal spot entirely lacking, much 
compressed. Sides thickly peppered with small inconspicuous chroma- 
tophores. Maxillary with three conical or tricuspid teeth: D. 11; 
G20 aa LO SOx O terete aieicienctsreeeieel ssiclons cere 10. panamensis Durbin. 
ll. Nine scales in a vertical series; caudal sometimes plain, with a faint spot. 
Maxillary with two minute teeth. Eye2to2.5inthehead. D.10or11; 
A. 17 to 24; scales 5-29 to 34-3.5 to4......... 11. gracilis (Reinhardt). 
kk. A small spot at the base of each caudal lobe; a row of spots along the base 
of the anal. Four to six small teeth in the maxillary. Ten to twelve, 
conical or tricuspid teeth in the second row of the premaxillary. D. 10 
or 11; A. 19 or 20 scales 4 or 5-32 to 34-3.5........... 12. riddlei (Meck). 
kkk. Caudal spot well developed, single. 
m. Maxillary without teeth, premaxillary with nine tricuspid teeth in the 
inner row. Lateral stripe silvery, no black; caudal spot confined to 
the peduncle. D. 10; A. 27; scales 5-32-3. 
13. stramineus Durbin. 
mm. Maxillary without teeth, very short. Premaxillary with five broad 
5- to 7-pointed teeth. Caudal spot continued forward as a heavy 
lateral stripe, often reaching the head. D.11; A. 14 to 16; scales 
DOL G-B2 160 .90=4/ OLD 3.002 < e <eye sole Miche teas 14. taurocephalus Ellis. 
mmm. Maxillary with or without one small conical tooth. Premaxillary with 
five 3-pointed teeth in the inner row. Caudal spot condensed or 
diffuse. D.11; A. 20 or 21; scales 5-32 to 34-8 or 4. 
15. parvellus Ellis. 
mmmm. Maxillary with two or three broad, 5- to 7-pointed teeth; premaxil- 
lary with five, 5- to 7-pointed teeth in the inner row. A black 
lateral stripe somewhat diffused in the humeral region, caudal spot 
continued on the middle rays but not to theirend. D. 11; A. 16 or 
Lie Beales 5-30 tO da—os - < «sere 2 ere ie eral eves erases 16. minimus Durbin. 
