Boone. — calamura portrri 
27 
tennae consists of a curiously shaped basal article followed 
by two shorter articles, and a flagellum of two quite lon- 
ger, relatively stout articles. 
The labium is extremely tapering and acuminate, 
appearing like a hollow cone slightly truncated and with 
this free edge finely serrate. The mandible consists of a 
slender^ pointed lancet Avhich widens basally, forming two 
expanded lobes and has a three jointed palp; the terminal 
joint has 12 strong subequal teeth forming a somewhat 
curved comblike effect along the ventral margin of the 
blade; the second joint is somewhat longer and more ro- 
bust than the distal joint and bears a conspicuous arange- 
ment of fine long setae which is attached just below the 
distal joint and serves as a sieve; the basal joint is relati- 
vely short. The maxilla consists of a slender tapering 
lancet finely toothed along the distal part and without an 
exterior limb. The maxilliped consists of a three jointed 
tortuous Ungulate plate tapering distally and having the 
distal margins beset with irregularly placed setae. 
Thorax.— The first thoracic segment is one and a half 
times as long as the head and is about the same width 
anteriorly but narrows slightly posteriorly and has the 
posterior line of segmentation emphasized; the second 
segment is very similar to the first but is only two thirds 
as long; the third segment is not quite as long as the se- 
cond, is squarish but relatively not so narrow posteriorly 
as the preceding segments and also has a heavy transver- 
se carination near the postlateral margin, then a narrow 
subcylindric ring which unites with a similar development 
of the anterior of the fourth segment, which is about as 
long as the third, but is quite different, being more con- 
vex, narrower anteriorly, swollen in the middle then 
narrower posteriorly, the posterior end being greater than 
the anterior, a deep carination extends near and nearly 
parallel to the posterior margin; the fifth segment is simi- 
lar to the fourth but a little less narrow anteriorly; the 
sixth segment is shorter than the fifth, les convex, is de- 
cidedly wider posteriorly than anteriorly, bears a heavy 
ridge along the anterior margin and a decided carination 
parallel to the posterior margin; the seventh segment is 
