46 HYMENOPTERA. 



Genus PENTARTHRON Riley. 



1. Pentartliron euproctidis species nova. 



Normal position. 



Fore wings slightly fumated proximad ; posterior wings without three 

 complete lines of discal cilia ; oblique line of cilia running back from 

 the stigmal vein long, with from 6 to 10 cilia, usually 7 ; males winged. 



Female. — Length, 1.15 mm. ; large for the genus. Similar in gen- 

 eral to the other species, especially nthiutum Riley, but averaging dis- 

 tinctly larger and differing in the following particulars: The discal 

 ciliation of the fore wing is somewhat denser ranging from 15 to 18 

 longitudinal lines across the widest portion of the wing blade and the 

 oblique curved line of discal cilia leading back from the stigmal knob 

 is nearly complete, that is, nearly joins a complementary or reciprocal 

 line to form a v-shaped line of cilia and contains from 6 to 10 cilia, 

 usually 7 ; in the posterior wings the cephalic longitudinal line of dis- 

 cal cilia contains from 6 to 8 cilia while the caudal line is three-fourths 

 complete, or is noticeably longer than in minutum and noticeably in- 

 complete as compared with seniifutnaturn ; it would require two or 

 three more of the cilia to be complete. General color variable, from 

 pale cadmium yellow to dusky, but usually the thorax pale cadmium 

 yellow, the abdomen dusky, contrasting somewhat, the head nearly 

 concolorous with the thorax with the face pallid, contrasting sharply 

 in some instances, the antennae concolorous with the thorax, the legs 

 the same but more pallid ; eyes bright red ; fore wings slightly fumated 

 as in minutum ; the venation dusky yellowish ; the apical tarsal joint 

 dusky. Antennae nearly similar to those of minutum, the two funicle 

 joints subequal, slightly longer than wide, both united subequal in 

 length to the pedicel which is obconic ; the solid club is usual, sub- 

 equal to the usual scape ; ring-joint normal. Mandibles with three 

 principal teeth which are subequal and apparently several very minute 

 ones between them. 



From 69 specimens, i-inch objective, 1-inch optic, Bausch 

 and Lomb. 



Male. — The same, but the face is pallid more often, concolorous 

 with the legs and contrasting with the rest of the body ; the antennae 

 are usual consisting of a scape, pedicel, one ring-joint and an indis- 

 tinctly 3-jointed funicle-club bearing the usual long, whorled hairs ; 

 the two segments of the funicle are not actually articulated, but the 

 articulations are indicated by slight but distinct constrictions between 

 the club and distal joint and between the two joints themselves ; taken 

 together they are somewhat shorter than the outline of the club itself, 

 but each is distinctly longer and broader than the pedicel. The tarsi 

 are not shortened as in apterous males and this sex is not smaller than 

 the female. 



