276 MAINE AGRICULTURAL EXPERIMENT STATION. I915. 



Adult. The adult is a reddish brown weevil somewhat less than one- 

 fourth of an inch long. 



The immature stages of Pseudanthonomus validus Dietz.* The species 

 Pseudanthonomus validus Dietz belongs to a genus of reddish weevils 

 which breed in the buds and fruit of various plants. This genus is 

 placed in the tribe Anthonomini, — a very characteristic group in the 

 Curculionidae. 



Very little has yet been done toward differentiating the immature 

 stages of weevils and it is, therefore, very difficult to present characters 

 for the separation of species. Ultimately we will find characters in the 

 arrangement of the folds of the body of the larva-e as well as in the 

 spiracles. The descriptions given herewith, used in connection with the 

 illustrations, will serve to identify this weevil. 



Larva. White, 3-4 mm. long. Head yellowish. The location of the 

 pits and hairs on the head is of considerable importance. These are 

 indicated in the drawing of the head. The labrum and clypeus seem 

 to be fused and are so transparent that the mandibles can be seen 

 through them. The ocelli are tiny and black. The antennae are single- 

 jointed. The mandibles have two strong teeth and are slightly asym- 

 metrical. The maxillary palpus is but 2-jointed and the labial palpus 

 i-jointed. See figure 57 A, B and C. 



Pupa. White, 3.5 mm. long. The pupae of the tribe Anthonomini are 

 characterized by having a chitinous apical process from the ninth 

 dorsal abdominal segment. The genus Pseudanthonomus is character- 

 ized by having this process slender with the apex abruptly bifid, the 2 

 processes almost at right angles to the axis of the process, apex sinuate. 

 Otherwise the pupa must be recognized by its tubercles. The prothorax 

 is provided with 8 pair of setigerous tubercles, more or less cone 

 shaped, 3 pair apical, 2 pair lateral, and 3 pair dorsal. The mesothorax 

 and metathorax each have 3 pair of little setae. The first 5 abdominal 

 segments are laterally provided with prominent setigerous tubercles, i 

 to a segment, and with 2 pair of dorsal setae. The sixth, seventh and 

 eighth segments are provided with 3 pairs of inconspicuous setigerous 

 tubercles arranged in a row on the dorsum. The beak is comparatively 

 short. See figure 57 D, E and F. 



NATURAL ENEMIES. 



Mr. Cooley has recorded that a species of Catolaccus para- 

 sitizes the beetles quite abundantly in Montana. The writei 

 has bred several adult Hymenoptera which he believes were 

 parasitic on this species, but none of them were reared under 

 such conditions as to furnish positive data. 



*By W. Dwight Pierce. 



