272 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



width. Width of thorax 1.4 times that of head. Abdominal segments 

 1-3 slightly narrower than thorax but all these three segments sub- 

 equal; segments 4 and 5 about i.i times width of segments 1-3, and 

 segments 6-8 equal to 1.3 times width of segments 1-3, cross section 

 and profile are the same as for capricornis. General color gray, with 

 series of 3 dark lines and 2 dark points on either side of midline in 

 ventrolateral regions of segments 6-8. 



Head: Designs on frons-clypeus and epicranial plates shown on 

 plate 41, figure 392. Each cephalic fan with 56-57 pectinate branches, 

 the hairs on these branches short, simple, close together, interspersed 

 at regular intervals with longer, stouter, bifid hairs. Mandible with 

 2 teeth on its inner margin, the teeth well separated from each other, 

 sharply pointed, the apical one somewhat longer. Antenna 440 ix long, 

 5-segmented, light yellow, the first three segments reaching the end 

 of the basal stalk of the cephalic fan; segment i>2>3<4>2; seg- 

 ment 2 superficially divided not far from its base at which area there 

 is a white patch ; white patches also present at apex of segment 3 and 

 base of segment 4 ; segment i with longitudinal striations. Submentum 

 with 9 apical teeth, in shape like one-half of a hexagon, the central 

 tooth and the outermost tooth on either side larger than the others; 

 ventrolateral row composed of 19 hairs in an irregular grouping, the 

 most distal 11 bifid near apex, the others simple. Occipital cleft 

 broadly dome-shaped, the apex with short tubelike extension (pi. 43, 

 fig. 429). 



Thorax and Abdomen : Pseudopod (thoracic proleg) with 37-39 

 rows of hooks at its apex; postclypeal sclerites long, distinct, but 

 poorly sclerotized, formed behind the extremities of the frons-clypeus, 

 well separated from each other. Posterior sucker with 194-206 rows 

 of hooks. Anal gills with 3 principal divisions, each with a fleshy base ; 

 each division with 25 fingerlike processes which are slender and 

 rounded at the apices. Anterior and posterior arms of X-shaped scle- 

 rite well sclerotized, the anterior arms with somewhat membranous 

 expansions along their outer margin and also between the two arms ; 

 4 simple, minute spines in transverse row just behind each of the pos- 

 terior arms ; rectal scales absent. 



Types. — Holotype ($), on 5 slides, collected from Rio Los Arcos 

 near Los Encuentros, Department of Solola, Guatemala, November 4, 

 1948; allotype (J* dissected from pupal skin), on 3 slides, collected 

 from Rio Samala, just beyond Totonicapan, Department of Totoni- 

 capan, Guatemala; paratypes, i $ and 13 pupae; ideotypes, 2 (^J*. 

 The holotype and allotype are in the collection of the United States 

 National Museum ; the paratypes and ideotypes are in the collection 

 of Herbert T. Dalmat. 



