WILLIAM G. DIETZ 125 



brownish. Mesopleural suture in part, and posterior margin of metapleura 

 tinted black. Halteres and legs as in P. montana. Wings with a yellowish 

 tint, more marked in costal cell; cell Sc and margin of Cu and Cu 2 yellowish- 

 brown; stigma dark brown, large; apex of wing infuscated, cord and veins M 3 

 and Cu 2 margined with fuscous. Venation as in figure. 



Abdomen light ocher-yellow; tergites two to six with ill-defined, pale brown, 

 posterior triangle; posterior margin of tergites two to six ferruginous, of tergites 

 seven to eight, blackish; a fuscous lateral stripe. Venter sordid yellowish. 

 Ovipositor as in P. montana. 



Holotype: 9 ; Floodwood, Schoolcraft County, Michigan. 

 July, 1915. (J. S. Royers.) 



Easily distinguished from allied species by the sordid yellow 

 antennae. Topotypic with P. calinota, it differs, aside from an- 

 tennal characters, in the broadly triangular, shining occipital 

 spot, the absence of the median black spot of the mesonotal 

 scutum, very distinct in all my specimens of P. calinota, and the 

 very different, abdominal markings. 



Pachyrhina nexilis spec. n. (PL IV, fig. 11; pi. VII, fig. 29.) 



Yellow. Antennal flagellum dark brown; vertex with three fuscous lines; 

 occiput with broad, triangular, shining spot. Thoracic dorsum as in P. evasa. 

 Wings hyaline; stigma dark brown. Median suture of ninth sternite of male 

 with chitinized, pendulous process. 



Male. Length, 12 mm.; wing, 11 mm. 



Head. Proboscis very short, concolorous; frontal prolongation anteriorly 

 and nasus, brown, the latter beset with black hairs. Mouth parts brown, 

 palpi brownish-yellow, the last joint longer than the preceding joints. An- 

 tennae of moderate length, scapal joints orange-yellow, third joint yellow- 

 ish-brown, paler at base, remaining flagellar joints dark brown, basal enlarge- 

 ment black, elongate and slightly emarginate beneath, last joint very slender, 

 verticels sparsely setulose, pubescence very fine, white. Face and underside 

 of head pale yellow; vertex and occiput orange-yellow, the former with three 

 linear, fuscous spots, the latter with large, broadly-triangular, shining spot. 



Thorax sulphur-yellow. Pronotal scutum tinted brownish on the sides. 

 The median praescutal stripe dark brown, edged ferruginous, narrowed pos- 

 teriorly, the lateral stripes ferruginous with median black line, the velvety 

 black, anterior spot large; scutum with oblique, ferruginous stripe each side, 

 the latter black anteriorly; transverse suture externally and its continuation 

 to alar insertion, black. Scutellum dark yellow, infuscate in the middle. 

 Postnotum sulphur-yellow on the sides, a broad median fuscous patch and fer- 

 ruginous posterior declivity. Pleura concolorous, lower portion of sterno- 

 pleura, lower part of mesopleura and metapleura anteriorly and posteriorly, 

 ocherous. Halteres yellowish at base, infuscate toward the knob, the latter 

 dark brown, white at the apex. Legs slender, coxae and basal portion of fem- 

 ora yellowish, the latter darker yellow towards the infuscated apex, tibiae 



TRANS. AM. ENT. SOC, XLIV. 



