192 
FOURTEENTH REPORT. 
this angle; a large spiny process one-third as long as the segment 
arises just distal to the center of the inner margin and projects prox- 
imally. Terminal segment of second antenna arcuate, concave on inner 
surface, curved inward at tip. Eyes of medium size. Penial append- 
ages cylindrical, bearing one dentate process at the inner distal angle 
and another near it on the inner margin : a sharp spine on the outer 
margin near the proximal end. Caudal appendages slender (more 
slender than in />. UndahU or B. coloradensis ) . 
Female: The five pregenital segments are produced laterally into 
strong spinous processes which grow larger posteriorily. The second 
antennae are slender, lanceolate and curved slightly outward at tip. 
Ovisac reaching to middle of sixth post-genital segment; eggs small. 
Length — Male, 16 mm. ; female, 17.2 mm. 
This species is described from eight males and three females (42360) 
collected in a pool at La Junta, Colorado, by Dr. G. S. Dodds. It is 
named for Professor A. S. Packard who contributed so largely to our 
knowledge of North American phyllopods. 
Streptocephalus texanus Packard. 
Dr. G. S. Dodds collected two males of this species (42357) from a 
pool near Ward, Colorado, at an altitude of 9,000 feet; and a single 
female (42358) associated with Tliamnoceplialus platyurus Packard 
from a pool near La Junta, Colorado. The writer collected a male 
(40526) and two females (40524) at De Witt, Nebraska, in 1896. 
Thamnocephalus platyurus Packard. 
Two males and a female (42359) were collected by Dr. G. S. Dodds 
in a “cattle pool” that had been filled with water from an irrigating 
ditch at La Junta, Colorado. These specimens are larger than those 
collected for Packard in Kansas; the males measure 31.5 mm. and the 
females 36 mm. in length. 
Apus aequalis Packard. 
This species was extremely abundant at De Witt, Nebraska, during 
the spring and summer of 1896 and between two and three hundred 
specimens of various sizes were collected (40517, 40518, 40521, 40535, 
40531,40532). The length varies from 15 to 34 mm. In smaller individuals 
22 or 23 somites are exposed behind the carapace, and in larger speci- 
mens there may be as many as 26. The length of the carapace at the 
median line is about equal to the portion of the body exposed behind. 
The armature of the telson is somewhat variable; on the dorsal side 
there is commonly one median spine, but there are often two; there are 
usually two lateral spines at the proximal edge of the telson, but there 
are frequently more. 
Estheria mexicana Claus. 
Ten specimens (40533) were taken from a pool near Salt Creek on 
If. Street in Lincoln, Nebraska, on October 13, 1894. 
