2 PROCEEDINGS OF THE NATIONAL. MUSEUM. vol. 66. 



found in North America with the exception of Trichischivs, the larva 

 of which is unknown, and Eucactophagus, of which the species listed 

 for North America are introduced forms not Imown to be established 

 in this country. 



SUBFAIMILY CHARACTERS. 



The following characters which are common to all larvae of this 

 subfamily will serve to distinguish them from other Curculionid 

 larvae : 



1. Curculionid larvae with head free, subglobular. Eighth and 

 ninth abdominal segments forming a sort of pygidial plate, eighth 

 with tergum declivous and without distinct tergal areas, ninth rather 

 small, somewhat flattened dorsally, either broadly rounded posteriorly 

 or terminating with two fleshy latero-cauclal projections, segment 

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

 segment small and ventral. 



2. Abdominal segments usually with three plicae on dorsal side but 

 occasionally with two or four. Abdominal hypopleura subdivided 

 into at least two and usually three or more superposed lobes. 



3. Ocellus one. 



4. Antennae fleshy, two- jointed, basal joint with several small 

 papillae. 



5. Mandibles stout, triangular, with simple or slightly bifid apex; 

 two dorsal setae. 



6. Maxillary palp two-jointed. 



7. Hypopharynx composed of a fleshy median area and two setose 

 lateral lobes. 



8. Spiracles bifore except in Rhynchophomis where bilabiate; all 

 spiracles lateral Avitli air tubes pointing dorsad except on eighth 

 abdominal segment where they are placed dorsally and with air tubes 

 pointing caudad. Spiracular opening oval. 



DETAILED DESCRIPTION. 



The full-grown larvae of the subfamily Calendrinae do not differ 

 radically in general appearance but vary in length from 2.5 mm. in 

 the genus Sitophil'ns to about 35 mm. in the genus Rhynchophorus. 

 They are white, legless, fleshy grubs, very thick-bodied. Body in- 

 tegument usually soft and smooth, sometimes with numerous chiti- 

 nized setae-carrying areas as in Rhynchophorus, and in some species 

 of Cactophagus with I'ows of small spines. 



Ten abdominal segments, ninth flattened and forming with the 

 eighth a sort of pygidial plate, tenth reduced and ventral. 



Head from very pale yellowish-brown to dark reddish-brown in 

 color; longer than broad and somewhat wedge-shaped, the sides 



