4 PEOCEEDINGS OF THE NATIONAL MUSEUM. vol. 66. 



and branched in others. In some genera the buccal side of ligula is 

 smooth, partly provided with, or in others entirely covered with a 

 dense mat of hairs. 



The main part of the floor of the buccal cavity is composed of the 

 hypopharynx, a fleshy median area, with two setose lateral lobes by 

 many authors interpreted as the maxillulae or paragnathae. Each 

 side of this hypopharyngeal complex is strengthened by a chitinized 

 arm of mentum. 



Epipharynx carries a pair of epipharyngeal rods. Between these 

 rods there are four or more small, thickened setae, the number and 

 arrangement differing in the different genera. These setae are simple 

 in most genera but branched in Scyphophorus. Epipharynx is often 

 more or less densely setose. 



Prothorax doi^ally not divided, but the two areas praescutum and 

 scuto-scutellum may be roughly indicated by rows of setae. 



The mesothoracic and metathoracic segments are divided into the 

 spindle-shaped praescutum, the scuto-scutellum, and the alar area. 

 Praescutum has one pair of setae and scuto-scutellum four pairs of 

 setae. 



The sternum of the thorax consists of eusternum and two coxal 

 or parasternal lobes more or less connected medianly behind the 

 eusternum. The eusternum of each thoracic segment bears a pair of 

 hairs. 



The abdominal segments are divided dorsally into from two to 

 four transverse areas. In Rhynchophorus and Cosmopolites an ad- 

 ditional intersegmental fold is present in front of praescutum. Be- 

 low these transverse areas and adjacent to epipleurum is the alar 

 area. Epipleurum itself dorsally limited by a somewhat indis- 

 tinct dorso-lateral suture and ventrally by a well-defined ventro- 

 lateral suture; it is large and not subdivided. Below the ventro- 

 lateral suture is hypopleurum. This is subdivided into at least two 

 and usually three or more superposed lobes. The ventral areas are 

 the coxal or parasternal lobes, eusternum, and sternellum. The anus 

 is transverse. Abdominal segments provided with setae as follows : 

 On each side of all typical segments praescutum bears one seta, 

 scutellum from three to five setae, alar area one or two setae, and 

 the epipleural lobe a pair of setae. One of the lobes of hypopleurum 

 bears one or two setae, the coxal lobe one seta, and eusternum two 

 pairs of setae. 



Eighth abdominal segment smaller than the typical segments, 

 tergum declivous and without distinct tergal areas. Ninth segment 

 rather small, somewhat flattened dorsally, either broadly rounded 

 posteriorly or terminating with two fleshy latero-caudal projections; 

 segment usually with four long terminal setae on each side. Tenth 

 abdominal semnent ventral and small. 



