6o 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



Head with a distinct median depression on the vertex, on either 

 side of which there is a high, very broad, rough, longitudinal ridge 

 rising just above and mesad of the antenna, the upper half split and 

 forming two diverging smaller ridges. Antennae short and moderately 

 clavate ; joints i, 3, and 4 subequal in length, broader than long; joint 

 2 nearly as long as joints 3 and 4 together ; joint 5 broadest and not 

 quite half again as long as the two preceding joints together, approxi- 

 mately twice as long as joint 6; joint 7 half as wide as 6, slightly 

 longer than broad. 



Fig. 30. — Dilophops bullatus. 

 13 to 15, oblique lateral view ; c, 

 view. 



1, first 3 segments, dorsal view; h, segments 

 last 3 segments, anal valves and scale, ventral 



First segment very strongly convex, completely covering the head 

 from above ; the narrow horizontal margin slightly higher than the 

 margin of the keels of the second segment, with 10 marginal scallops ; 

 surface almost entirely occupied by two transverse rows of very large 

 and high tubercles, four tubercles in the anterior and six in the pos- 

 terior row ; in addition, there are a few small granules arranged in 

 three transverse rows with the rows separated by the rows of larger 

 tubercles. Segments i, 2, and 3 are shown in figure 30, a. 



Ensuing segments with four longitudinal rows of large tubercles 

 which are considerably smaller than the tubercles of the first segment. 

 On segment 2 there are three tubercles in each outer row and two 



