6o2 Journal of Agricultural Research Voi. xii.No. 9 



FAMILY PSALIDURIDAE PIERCE (1914) 



Rhigopsidius tucumanus Heller (1906) 



This weevil has been recorded by the writer ^ from Tucuman, Argen- 

 tina; Cuzco, Temuco, and Arequipa, Peru; Oruro, Bolivia; and Ancud or 

 San Carlos and Castro Islands, Chile. The weevil belongs to the sub- 

 family Rhytirhininae and the tribe Rhytirhinini. 



FAMILY PSALLIDIIDAE PIERCE (1916) 



Premnotrypes solani Pierce (1914) ^ 



This weevil was described from the mountain districts of Peru. It 

 belongs to the subfamily Entiminae and the tribe Ophryastini. 



Trjrpopremnon latithorax Pierce (1914) ^ (PI. 29, 30) 



This weevil was described from Cuzco, Peru. It belongs to the same 

 tribe as Premnotrypes. The ventral tooth of the mandible does not 

 belong to the deciduous piece as stated in the original description. 



On June ii, 1914, Mr. H. L. Sanford found several larvae of this species 

 in potatoes from La Paz, Bolivia, collected by Mr. H. T. Knowles, under 

 Federal Horticultural Board No. 2475. On June 20-26 pupae were 

 noticed, and an adult emerged on June 26. 



This enables the writer to describe these stages. 



Larva (PI. 29). — Length 12.5 mrn. when crawling, 10 mm. when slightly curved. 

 It is typically rhynchophorid in form, white, with light reddish brown head and dark 

 mandibles. The essential diagnostic characters are illustrated by the author in 

 Plate 29. 



From the base of the head a median pale line passes forward. This is the epicranial 

 suture. It divides behind the frons and forms the two frontal sutures. The frons is 

 subtriangular, rounded behind and margined in front by the epistoma. The epicranial 

 areas are the two large areas at each side of the epicranial suture, further bounded by 

 the frontal sutiu-e, the pleurostoma, and the hypostoma. In front of the frons is the 

 clypeus, and in front of this is the labrum. The clypeus and labrum partly overlap 

 the mandibles which arise at the side of the clypeus based on the pleurostoma. Below 

 the hypostoma at the sides of the mandibles arise the maxillae, of which the cardo is 

 a Very large basal area. Located on the median line below the mouth opening, which 

 is covered by labrum and mandibles, is a shield-shaped area known as stipes labii. 

 Below and around this is the large basal area consisting of mentum and submentum. 



There is a small abortive branch of the frontal suture extending back on the epicra- 

 nium, on each side of and not far from the epicranial suture. It is terminated by a 

 setigerous puncture. On the epicranium there are setae arranged as follows on each 

 lobe: One at terminus of branch of frontal suture, one on the frontal suture, two oppo- 

 site middle of frons, one basal, two discal , one opposite base of mandible, two on hypo- 

 stoma. On the frons there are three pairs of setas, the two posterior pairs being about 

 equidistant, the anterior close to the antennae. At base of clypeus there are four 

 tiny hairs. On labrum are four subbasal, six subapical, and six marginal hairs. The 

 mandibles have one hair each. The maxillae are provided with two-jointed palpi 

 (PI. 29, F), and a very broad setose lacinia, two setae near base of palpi and one 

 near base. Some of the hairs are clavate as shown in the illustration, but this is not 

 always true, some specimens having normal hairs. The stipes labii has one pair of 

 hairs. Each lobe of the mentum has one pair. 



> Pierce, V»'. d. Op. cit. 



