TRIBE II. IPINI. 627 



SYNOPSIS OF GENERA OF IPINI. 



o. Base of thorax margined; declivity alike in both sexes. 



I. PlTYOPHTHOKUS. 



aa. Base of thorax not margined; declivity with larger teeth in male. 



ft. Antennal club not pubescent on both sides. II. PITYOGENES. 



6&. Antennal club pubescent both sides. III. IPS. 



I. PITYOPHTHORUS Eichhoff, 1864. (Gr., "pine" -j- "destroyer.") 



As defined by Hagedorn, this genus includes those species in 

 which the funicle is 5-jointed; antennal club with sutures (Fig. 

 137 C.) ; thorax longer than wide, unequally sculptured, rough- 

 ened in front, more or less smooth behind, its base bordered by a 

 fine raised line; elytra cylindrical, feebly sculptured, usually re- 

 tuse at declivity, alike in the two sexes. The species are small (2 

 mm. or less) beetles, for the most part infesting terminal twigs 

 of a variety of trees; the males are often provided with a con- 

 spicuous tuft of yellow hair on front of head, found also in some 

 species of Pityogcnes. 



SYNOPSIS OF SPECIES OF PITYOPHTHORUS. 



a. Male with dense brush of long yellow hair on front of head (except 



consimilis}. 



b. Elytral punctures confused, not in distinct rows. 

 c. Elytral punctuation fine, surface pubescent. 

 (I. Elytral pubescence dense on declivity. 



e. Pubescence sparse on basal area, denser on declivity, always 

 hair-like. 1005. MINUTISSIMUS. 



ee. Pubescence moderately dense on basal area, denser on de- 

 clivity, always scale-like. 1006. PRUINOSITS. 

 dd. Elytra thinly clothed with short, erect, gray hairs. 



1007. PUBERTJLUS. 

 oc. Elytra strongly punctured, pubescence sparse, long and erect. 



1008. PULICARIITS. 

 6&. Elytral punctures arranged in more or less distinct rows. 



/. Thorax smooth in posterior area. 1009. TOMENTOSUS. 



ff. Thorax more or less punctate in posterior area. 



g. Thorax finely and sparsely punctured in posterior area; as- 

 perities of anterior area arranged in more or less concentric 

 rows. 

 /(. Declivity of elytra flattened and retuse. 



i. Asperities in sharply raised concentric lines; declivity 

 broadly sulcate, retuse, its suture and elevated margin 

 subtuberculate. 1010. CONCENTRALIS. 



ii. Asperities less marked. 



j. Margin of declivity sparsely crenate. 1011. CONSIMILIS. 

 jj. Margin of declivity simple. 1012. ANNECTENS. 



hh. Declivity not flattened or retuse. 1013. SERTATUS. 



gg. Thorax coarsely or rugosely punctate behind. 



