22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



with small dark condyle (co) articulating with small dark socket on 

 tentorium. Each cardo with Y-shaped, sometimes V-shaped, brace 

 (br) running forward from condyle, outer ramus defining lateral 

 margin of cardo, inner ramus running slightly laterad to middle, 

 reaching and articulating wuth base of stipes ; small seta between 

 rami of strengthening sclerotization. Stipes (stp) large, subrec- 

 tangular, sides almost straight, base truncate; usually 5 or 6 promi- 

 nent setae on antero-lateroventral aspect; i or 2 minute setae (or 

 pegs) and scattered pores observable under high magnification. Proxi- 

 stipes and dististipes not distinct, but distal part somewhat darker, 

 ending anteriorly in whitish membranous or semimembranous palpi- 

 fer (plf) supported dorsally by small subtriangular sclerite (scl, 

 fig- 3> /) ; anterior dorsal aspect bearing a few branched hairlike 

 filaments.- Lacinia (lac, fig. 3, c) elongate, anteriorly bluntly pointed ; 

 borne in almost vertical plane somewhat dorsal to galea, indistinctly 

 defined proximally ; densely clothed with long, yellow, branched seta- 

 like filaments projecting into preoral cavity. Galea (ga, fig. 3, c; 

 fig. 3, d, e) two-jointed. Basal joint (i) subcylindrical, usually 

 only portions sclerotized ; slightly shorter than terminal joint ; with- 

 out setae or pores. Terminal joint {2) narrower than basal segment; 

 outer margin longer than inner margin; 3 to 10 pores on latero- 

 ventral aspect; tip (fig. 3, d) inclined inward, terminating in pro- 

 trusible thimble-shaped membranous process bearing many "sensory" 

 structures. Maxillary palpi (pip, fig. 3, c; fig. S, b) four-jointed, 

 all joints subcylindrical. First joint (/) wider than long; distally on 

 mesoventral surface with group of 4 small pores, i relatively large 

 seta and i small seta (sometimes i or 2 additional minute setae). 

 Second joint {2) wider than long, almost equal in size to first joint; 

 without setae; two pores. Third joint (j) wider than long, about 

 one-half length of second joint; two pores ventrally; distally with 

 I small seta on mesoventral aspect and i near lateral aspect. Fourth 

 joint (./) at least as long as wide; nearly as long as third joint; with 

 I minute seta and i pore dorsally ; group of minute "sensory" papil- 

 lae on apex (fig. 3, a). 



Labium composed of postmentum and first and second prementum. 

 Postmentmn (pint, figs, i, b; 9, h) elongate, sides subparallel, trun- 

 cate anteriorly, bluntly rounded posteriorly. One long seta (some- 



- These filaments are commonly referred to as "setae," but being unarticulated 

 at the base they are not true setae in the generally accepted sense (Ferris, 1934, 

 p. 145). Similar branched filaments are found on laciniae, prementum, hypo- 

 pharynx, and elsewhere in the preoral cavity. 



