32 BULLETIN: MUSEUM OF COMPAKATIVE ZOOLOGY. 



Ocelli very large; bluish. 



Antennae long, being one half or nearly one half as long as the 

 body. Articles 38 or 39, of which the second is mach longer; the 

 fourteen articles succeeding the second are short and closely telescoped, 

 the first four in this series being commonly somewhat larger than 

 the others; articles distad of the sixteenth clearly longer and more 

 freely joined, with shorter ones in pairs normally alternating with 

 single longer ones in the usual way, excepting the six ultimate which 

 are all of the longer type. 



Dorsal scuta well arched, with lateral and caudal borders depressed 

 and the lateral margins bent somewhat dorsad; each with a distinct 

 median longitudinal furrow extending entirely across plate; on each 

 side several shorter sulci of which the two most mesal converge 

 together caudad, forming thus a v-shaped mark. Posterior angles 

 of ninth, eleventh, and thirteenth dorsal plates produced. Caudal 

 margins of plates apparently less incurved than in dolichopus. 



Caudal margin of more anterior sternites truncate, but in the pos- 

 terior ones more or less convexly rounded. Plates marked with fine 

 transverse furrows of which one caudad of and one cephalad of the 

 middle are usually distinctly deeper. 



Prosternum twice as wide as long. Anterior margin semicircular. 

 Teeth 3+3; subequal; the interval between these teeth in some 

 about equal but in others the outer one on each side is more widely 

 removed from the median than the latter is from the innermost. 

 (Plate 4, fig. 6). 



Legs of usual type, all being long and having tarsi markedly slender 

 with the first joint especially long. The small, pointed process at distal 

 end on dorsal side of the prefemora better developed and more spine- 

 like on the more caudal pairs of legs. Tibial process present in first 

 fourteen pairs of legs only. (Plate 4, fig. 8). 



Anal legs in both sexes long and slender and without special modi- 

 fications. The lengths of third, fourth, fifth, sixth, and seventh arti- 

 cles are to each other about as 38:41:50:61:28 and their widths as 

 13:11.5:8:4:3. In the penult legs the lengths of these joints are 

 related as 31:35:41:45:16. 



Porigerous surface of last five pahs of coxae but moderately de- 

 pressed and the furrow typically not extending entirely to distal end 

 of the joint, the lateral walls or chitinous ridges uniting distad of it 

 to form a median keel. Pores circular, decreasing in size proximad; 

 2, 3, 3, 3, 3-3, 4, 4, 4, 4. 



Claw of female gonopods long and acute, but moderately curved, 



