FISHES OF COLORADO 9 1 



55 mm., Dytiscid beetles, 100 per cent. 



60 mm., Dytiscid beetles, 50 per cent; adult diptera, 50 per cent. 

 45 mm., caddis-fly larvae, 25 per cent. Not full. 



50 mm., ostracods and cladocerans, 50 per cent; one large caddis-fly larva. 

 45 mm., Entomostraca, 25 per cent. Not full. 

 50 mm., caddis-fly larvae, 50 per cent. Not full. 

 50 mm., caddis-fly larvae, 100 per cent. 

 St. Vrain Creek, Longmont, October 17, 1903. 



90 mm., twelve gastropods, Physa sp., 100 per cent. 

 60 mm., seven gastropods, Physa sp., 100 per cent. 



Two females, 45 and 50 mm., from Julesburg, July 19, contained large and 

 well-formed eggs. 



Fmtdulus floripinnis is a species of the western portion of the South Platte 

 drainage. It has been wrongly ascribed to the Arkansas drainage since the collec- 

 tion from which it was described was stated by Cope {I.e.) to be from Cherry 

 Creek near Denver, a tributary of the Arkansas; this creek flows, however, into 

 the South Platte, not into the Arkansas. 



Colorado specimens. — University museum: St. Vrain Creek, Longmont, October 17, 1903 

 (10 specimens, 55-95 mm.), C. Juday and D. W. Spangler, No. 22; Boulder Creek, Boulder, 

 October, 1903 (15 specimens, 30-50 mm.), C. Juday and J. Henderson, No. 40; Boulder Creek 

 6 miles east of Boulder, July 25, 1912 (7 specimens, 35-55 mm.), M. M. Ellis, No. 395; South 

 Platte River, Julesburg, July 19, 1912 (53 specimens, 30-50 mm.), J. Henderson and M. M. Ellis, 

 No. 396; Lodgepole Creek near Ovid, July 20, 191 2 (20 specimens, 50-60 mm.), J. Henderson and 

 M. M. Ellis, No. 397; Boulder Lake near Boulder, October 16, 1913 (20 specimens, 30-50 mm.), 

 M. M. Ellis. 



Order Apodes 



The Eels and Eel-like Fishes 



Shoulder girdle free from the skull; ventral fins wanting; premaxillaries 

 reduced or wanting; caudal fin confluent with the dorsal and anal fins; body 

 elongate, snake-like. 



Family ANGUILLIDAE 

 True Eels or Scaly Eels 



Scales very small, imbedded in the skin; teeth in bands on both jaws and 

 vomer. 



The true eels are quite abundant in both fresh and brackish water, being found 

 in tropical and temperate regions throughout the world except on the Pacific slope 

 of the Americas and the islands of the Pacific. They are quite abundant in the 

 West Indies. The family is represented by but a few living species all referable 

 to the genus Anguilla. The several species are quite closely related and may 

 perhaps be reduced to three, one found in Europe, one in Asia and one in the 

 Americas. 



