74 PROCEEDINGS OF THE NATIONAL MUSEUM. tol. 53 



at once to the dorsal portion below the ovaries and is strongly flat- 

 tened dorso-ventrally between the ovaries and oviducts; rectum 

 fairly long and inclined dorsally. 



Ovaries two-third as long as the oviducts and not much flat- 

 tened, but cylindrical and pointed at the posterior end; oviducts 

 slightly flattened and in about the center of the trunk dorso-ven- 

 trally ; cement glands relatively narrow, the lumen of the glandular 

 portion scarcely wider than the duct, the two about the same length 

 and both reduced to a mere line. 



The chitinogen layer of this species would have been extremely sat- 

 isfactory to Claus in his search for " subcutaner Drusen." It is thin 

 and uniform along the midline dorsally and ventrally and for some 

 distance on either side, especially between the ovaries and the dorsal 

 surface. But along the sides of the bodj^ and more particularly 

 around the anterior and posterior ends of the trunk it is greatly 

 thickened, as shown in figure 78, and nearly every cell communicates 

 with the exterior through a pore canal in the chitin layer. Along 

 either side ventrally, where the chitinogen layer begins to thicken, 

 there is a row of 12 large glands, whose central lumen opens through 

 a pore. 



These glands are seen in section in figure 78, and in surface view 

 enlarged in figure 79. Each consists of five or more cells arranged 

 radially around the central lumen, and in the cleared specimen they 

 are dark cinnamon brown in color and so opaque as not to show their 

 nuclei. 



It is especially worthy of note that this chitinogen layer covers 

 the enlarged portion of the neck and the soft horns of the cephalo- 

 thorax, thus offering a sharp contrast with the genus Laernaeenicus, 

 whose horns and neck are completely chitinized. 



Color (preserved material), a brownish yellow, darker on the cepha- 

 lothorax and trunk, lighter on the neck. 



Total length, 22 mm. Length of cephalothorax, 1.35 mm. ; width, 

 2 mm. Length of trunk, 9 mm. ; width, 2 mm. 



{lohatuSj lobed, alluding to the upper and lower lips.) 



Genus PHRIXOCEPHALUS Wilson. 



Phrixocephalus Wilson, Proc. U. S. Nat. Mus., vol. 35, 1908, p. 461. 



External generic characters of female. — Cephalothorax a short 

 cylinder, somewhat flattened and chitinized, sending out from one 

 to three pairs of lateral cylindrical horns, more or less branched and 

 chitinized, and a few frontal processes in the form of knobs or short 

 horns. Neck cylindrical and hardened, with one or more sets of 

 horns, simple or branched, the last set opposite the fourth legs; in- 

 serted in the trunk eccentrically, to one side of the midline, and some- 



