150 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL, I25 



dark, irregularly triangular design on its posterior half, the design 

 not interrupted by nonpigmented regions although clearly marked 

 areas of contrasting intensity of color are visible ; epicranial plates 

 (pi. 40, fig. 368) of each side with 2 extensive dark areas along the 

 posterior margin, each with 3 or 4 small markings within, those in 

 the more lateral area appearing somewhat lighter than the surrounding 

 region. Each cephalic fan with 31-33 nonpectinate branches. Mandi- 

 ble with 2 flattened teeth on its inner margin, these being close to- 

 gether but not appearing to arise from a common base; more distal 

 tooth about twice the length of the other. Antenna 275 ju, long, 4- 

 segmented, transparent yellow, just reaching the apex of the basal 

 stalk of cephalic fan ; segment 2 divided into two near its midregion 

 giving the antenna the appearance of having 5 segments ; segments i 

 and 2 about equal in length, either of these longer than segment 3; 

 segment i with longitudinal striations. Submentum with 9 apical 

 teeth, all of almost equal size, blunt, their lateral margins parallel; 

 ventrolateral row composed of 3 fairly short, stout hairs, the middle 

 one trifid near its apex, the basal one simple ; lateral margin of sub- 

 mentum with 4 toothlike structures, the most apical one separated 

 from the other three and appearing to emerge from the lateral margin 

 of the outermost of the apical teeth ; 4 small hairs emerging from 

 ventral surface of median plate. Occipital cleft dome-shaped, the apex 

 with a slight concavity (pi. 42, fig. 405). 



Thorax and Abdomen : Light cream color with purple collar near 

 anterior margin ; pseudopod (thoracic proleg) with 20-25 rows of 

 hooks at its apex ; postclypeal sclerites in form of small, heavily pig- 

 mented circles that are well separated from each other. Posterior 

 sucker with 80-84 rows of hooks. Anal gills in form of 3 very broad, 

 conical structures that taper considerably from their base to apex; 

 on the ventral surface of the middle trunk there is a single, short, 

 fingerlike projection emerging from near the midregion ; from near 

 the same region of the right trunk, and extending to its apex, emerge 

 2 long projections; from the left trunk 3 such fingerlike projections 

 emerge and also extend to its apex ; thus the anal gills have 9 branches 

 in all. The X-shaped sclerite is simple, well sclerotized, with no pig- 

 mented patches between the arms ; no rectal scales. No ventral papillae 

 or plaques on eighth segment. 



This larva has been placed in the subgenus Lanea because it pos- 

 sesses the following combination of characteristics : Mandible with 2 

 teeth on its inner margin; occipital cleft well formed and not reach- 

 ing submentum ; antennae 4-segmented (rather than 5-segmented, 

 with further superficial divisions of second segment) ; posterior sucker 



