BRUCE F. CUMAIINGS — NONDESCRIPT ANOPLURA AND MALLOPHAGA. 41 



of it and situated along the lateral margin of the area ; numerous other small 

 hairs arranged symmetrically ; several minute hairs around the clypeus. 

 Maxillary palpi long, joints almost equal. Labium with two lobes on each side 

 bearing hairs. Hypopharynx with two well-developed fringe I lobes in front, 

 a central bar of chitin running out from a broad plate behind. Antennae. 

 club-shaped, five-jointed, concealed in fossae. Thorax : pronotum with well 

 developed lateral " wings," elegantly narrowed behind ; two longitudinal brown 

 bands of thicker chitin divide the pronotum into three areas ; the bands curve 

 in and unite at the posterior margin ; a median groove is present ; a few short 

 sharp spines close together on the upper side of the " wings." In the middle 

 area of the pronotum a row of four hairs, and another row of four hairs just 

 behind ; on the posterior margin of the pronotum, two long bristles with two 

 smaller ones in front of each. The metanotum shorter, but broader, than the 

 prothorax, being broadest on the abdomen. Spines arranged roughly in the 

 form of an M ; other spines arranged as indicated in the figure. Thoracic 

 sternal areas decorated with stout spines, which on the prosternum are confined 

 to the lateral areas. A somewhat complicated endoskeleton : two stout bars 

 running in like clavicles towards the sternum from the " shoulders " of the 

 pronotum ; in the metathorax there is a bifid bar, one limb forming the margin 

 of the metanotum and the other sloping doAvn at the side to the ventral surface. 

 Legs strong and spiny ; onychium large, with the edge crenulate. Hind pair of 

 legs stouter than the rest, with stouter spines, particularly on the tibiae. The 

 tarsi with one or two long silky hairs. Abdomen broadest beyond the middle, 

 ovate. Each tergite and sternite with two rows of stout hairs arranged trans- 

 versely, those in the posterior row being longer than those in the anterior ; 

 tergite I with only two hairs in the first row. On the ventral surface, the 

 outside spines of the second row of each segment very large and brown in colour. 

 Pleural angles of the last few segments more pronounced and carrying longer 

 bristles. Terminal segment rounded in the <5, the genital armature peculiar 

 (fig. 4Z>). In the Q, segment VIII with a semicircular plate ventrally covering 

 the genital aperture ; IX ventrally with an oblique row of bristles on each side, 

 and behind each row an oblique band of chitin which runs backwards towards 

 the vulva, where it bifurcates. The sexes are alike, except as regards the 

 terminal segments. 



Length (in mm.), $ Q, 2'20 ; head, r$ Q, 0*3 ; thorax, S Q? 0'6<5 ; abdomen, 

 1*25 ; greatest width, rf Q, 0*75. 



Host : Cavia apcrea, Erxleben. 



Paraguay : Villa Pica, 6. xi. 1910 (F. Posner). Presented by the Hon. N. 

 Charles Rothschild. 



In specimens of both sexes, prepared with potash, a dense row of teeth and 

 two dentate flaps (fig. 4a) are visible through the integument of the first or 

 second abdominal segments in the position occupied by the crop. Snodgrass, 

 in his "Anatomy of the Mallophaga " (Occas. Papers Californian Aead. of 

 Sciences, vi, 1899, p. 145), does not refer to the presence of gastric teeth in 

 this order, so that perhaps it is worth while that attention be directed to them 

 in Trimenopon. 



