CHAMBERLIN: HENICOPIDAE or AMERICA NORTH OF MEXICO. 29 



proximate and often elevated together, the outermost being separated 

 by a wider and deeper interval and the prosternal margin beneath it 

 less produced. 



The posterior angles of the ninth, eleventh, and thirteenth dorsal 

 plates strongly produced. Dorsal plates strongly arched; each of 

 the major scuta with five more or less evident longitudinal sulci, two 

 lateral parallel with each side, one msdian and two intermediate 

 diverging caudad; the two lateral sulci continuous with a transverse 

 depression or furrow (sometimes double) running parallel with and a 

 little cephalad of the posterior margin, corresponding lines often 

 being traceable on the head. 



Ventral plates with a number of transverse impressed lines on caudal 

 half, one at middle and one between this and caudal margin ordi- 

 narily deeper than the others. 



Legs all long, the more caudal ones being conspicuously so and 

 ordinarily elevating the caudal portion of body considerably. Tarsi 

 relatively long, the first joint being much longer than the second. 

 Tibial process present on each leg of the first fourteen pairs 



Anal legs very long and slender, not at all crassate or otherwise 

 specially modified in either male or female. 



Last five pairs of coxae deeply furrowed or fluted along caudoventral 

 surface, the furrow being limited by well-chitinized ridges or plates. 

 In these furrows occur the uniseriate, circular pores which in number 

 and arrangement vary from 3, 3, 3, 3, 3 to 3, 4, 5, 5, 4. 



Claw of female gonopods large, acute, and weakly incurved. Basal 

 spines 2+2 or 2+3; the flattened, broader surface, conical in outline 

 with the inner one set nearly at right angles to the outer and in ventral 

 view therefore appearing much thinner; both spines usually bent 

 ectad at distal end. 



Anal glands conspicuous; the common median passage relatively 

 large. 



Length 11.4-12.6 mm.; width 1.5-1.7 mm.; length of antennae 

 5.6-6 mm. ; of anal legs 6-6.5 mm. 



Praematurus. Ground color light brown to yellow, but in life this 

 color mostly masked by the violet from beneath. Head appearing 

 purple, often very dark. Antennae light brown or yellow. Ventral 

 plates in life appearing mainly violaceous or lavender. 



Antennae composed of from 31 to 36 articles. 



Prosternal teeth 3+3 as in the adult. 



Coxal pores moderately large; groove shallow; 2, 2, 2, 2, 2-3, 3, 3, 

 3,3, 



