8 PROCEEDINGS OF THE NATIOISrAL MUSEUM. vol. 66. 



thickened setae that are simple in some species and branched in 

 others. Epipharynx somewhat setose and with two pairs of small 

 thickened setae between the epipharyngeal rods. Maxillary mala 

 oval at tip, with a row of eight branched setae on dorsal surface, 

 the basal two being bifurcate at tip, the rest many-branched, tip of 

 mala with two simple and one branched setae. Ligula dorsally 

 setose. Hypopharynx fleshy, laterally densely setose and with a 

 tuft of hairs at posterior limit. Abdominal terga above divided into 

 three distinct areas. Abdominal hypopleurum four-lobed. 



Genus RHYNCHOPHORUS Herbst. 



Plate 7, figs. 1-7 ; plate 10, fig. 9. 



The larvae of this genus breed in the trunks of palm trees. They 

 are the largest of the Calendrid larvae that occur in North America 

 and may attain a length of 35 mm. or more. Labrum with about 

 twenty simple, thickened marginal setae. Epipharynx setose and 

 with two pairs of small thickened setae between the epipharyngeal 

 rods. Maxillary mala subquadrate at tip, with a row of simple and 

 branched setae and a basal group of numerous branched setae on dor- 

 sal surface, and with three simple setae at tip. Ligula not setose. 

 Hypopharynx fleshy and laterally densely setose. Body provided 

 with numerous small chitinous seta-carrying areas. Abdominal 

 terga divided above into three distinct areas and with additional 

 intersegmental fold. Abdominal hypopleurum four-lobed. 



Genus SCYPHOPHORUS Schtinherr. 



Plate 8, figs. 1-7; plate 10, fig. 7. 



The larvae of this genus breed in plants of the Yucca family and 

 related families. They may attain a length of at least 18 mm. 

 Labrum with twelve thickened, marginal setae of which some are 

 simple and others branched. Epipharynx setose and with two paii*s 

 of branched thickened setae between the epipharyngeal rods. Maxil- 

 lary mala oval at tip, with a row of eight branched setae on dorsal 

 surface and with one branched and two simple setae at tip. Ligula 

 not setose. Hypopharynx fleshy, laterally densely setose. Abdomi- 

 nal terga above divided into three distinct areas. Abdominal hypo- 

 pleurum five-lobed. 



Genus YUCCABORUS LeConte. 



Plate 9, figs. 1-7 ; plate 10, fig. 5. 



The larvae of this genus breed in the plants of the Yucca family. 

 They may attain a length of at least 15 mm. Labrum with about 

 eighteen marginal setae nearly all of which are very much branched. 



