THE AMERICAN TETRAGONOPTERINAE. 137 
i. Asilvery area on the upper half of the caudal peduncle. Anal lobe dusky, lateral 
stripe and caudal spot very evidently continuous. 
j. Depth 3.6 to 3.8. Second suborbital about half the eye in width, leaving a 
naked margin behind and below. Maxillary with one or two narrow 4- 
pointed teeth. D.11; A. 14 or 15; scales 5-32 or 33-3. 
10. hyanuary Durbin. 
jj. Depth 3. Second suborbital about three fourths the eye in width, in contact 
with the preopercle. Maxillary with three, 3-5 pointed teeth. D. 11, 
ING CRY ECAC Gas Py} (roles =s are Og BU SIoe aoe mnO Hoon es 11. matei Kigenmann. 
ai. No silvery area on caudal peduncle; caudal spot and lateral stripe only dimly 
connected. Second suborbital in contact with the preopercle. 
k. Caudal peduncle slender, its depth 1.5 in the distance from the base of the 
middle caudal rays to the base of the last anal ray. Caudal spot not as 
wide as the caudal peduncle, on the middle caudal ray and not con- 
tinued forward to the vertical from the adipose. Head 4; depth 2.7 
to 38. Maxillary with two to four, conical or tricuspid teeth. D. 11, 
A. 22-24; scales 5-32 to 34-2 to 3.5........ 12. rodwayi Durbin. 
kk. Caudal peduncle deep, its depth equal to the distance from the base of the 
middle caudal rays to the base of the last anal ray. Caudal spot on the 
caudal peduncle, extending backward to the tips of the middle caudal 
rays, and forward to a vertical from one of the last five anal rays. Head 
3.5; depth 2.6. Maxillary with two or three 3- to 5-pointed teeth. D. 
11; A. 20 to 22; scales 5-29 to 33-3 or 4........... 13. brevis Ellis. 
kkk. Caudal spot intense, continued backwards along the middle caudal rays 
and along the edge of each caudal lobe. Anal falcate. Head 3.4. 
Maxillary with two 5-pointed teeth. D.11; A. 16-19; scales probably 
ALOV GSO MOO Om eres ecyesere evel cle siaisiciete auteresscoue 14. tridens Kigenmann. 
ddd. Humeral and caudal spots both developed. 
l. Dorsal equidistant from base of middle caudal rays and tip of snout, or 
nearer the caudal. 
m. Origin of the dorsal equidistant from front of eye and caudal. Origin 
of the anal on the vertical from the last dorsal ray. Second sub- 
orbital leaving very narrow naked margins below and behind. 
Humeral spot distinct, vertically elongate, surrounded by a bright 
area, often with a second elongated spot behind the bright area. 
An iridescent spot on the upper half of the caudal peduncle. 
Caudal spot often continued along the edge of each caudal lobe. 
Maxillary with two or three, conical or tricuspid teeth. Depth 
2.5; D.11; A. 22 to 26; scales 5-30 to 33-3 to 3.5. 
15. ocellifer (Steindachner). 
mm. Origin of dorsal half the length of the head nearer the caudal than 
the snout. Origin of the anal on the vertical from the first or 
second dorsal rays. No bright area around the vertically elongate 
humeral spot. Second suborbital in contact with the preopercle. 
Maxillary with one tricuspid tooth. D.11; A. 22; scales 5-30-3. 
16. bowlengeri Eigenmann. 
mmm. Origin of dorsal slightly nearer middle caudal rays than tip of snout. 
Origin of anal on the vertical from the first to third scale behind 
the dorsal. Caudal spot wider than long, not continued backwards 
on the caudal peduncle. Humeral spot small. Maxillary with 
two, 4- or 5-pointed teeth. Second suborbital leaving narrow 
naked margins below and behind. D. 11; A. 15-17; scales 
OOO ate orl oe ome cna Riche arse gai eateries 17. iota Durbin. 
mmmm. Origin of dorsal equidistant from snout and base of middle caudal 
rays; origin of anal under dorsal; caudal spot not continued on 
the caudal; maxillary with four or five 6-pointed teeth; third 
suborbital in contact with the preopercle behind. D. 11; A. 
24-25; lateral line 38-35............ 18. barrigonae Kigenmann. 
ll. Origin of dorsal nearer snout than base of middle caudal rays. Humeral 
