120 NORTH AMERICAN TIPULIDAE 



hypopygial appendages, and both of which it resembles in the 

 fuscous, flagellar joints, yellow at the base. The mesonotum 

 is less opaque than in P. tenuis but lacks the luster of P. brevi- 

 cornis. The paratype specimen has the thoracic dorsum less 

 opaque and the stripes ill-defined, with the interspaces obliterated. 

 The costal cells are paler. Together with P. okefenoke Alexander 

 and cornifera sp. n., these three species, because of the greatly 

 developed inner appendages of the hypopygium, form a peculiar 

 group in our Southern States. For differentiation see under 

 cornifera and also Table of Species. 



Pachyrhina cornifera spec. n. (PI. IV, fig. 6; pi. VI, fig. 25.) 



Bone yellow. Flagellar joints, except the two basal joints, brown. Tho- 

 racic dorsum opaque. Wings with faint, yellow tinge, stigma dark brown. 

 Abdomen with lateral and ventral rows of black spots. Inner apical appen- 

 dages of male hypopygium, slender, serpentine, directed laterad. 



Male. Length, 14 mm.; wings, 15 mm. 



Head pale yellow. Mouth parts and palpi brown. Frontal prolongation 

 shining, beset with pale, yellowish hair; sides of rostrum light brown. Anten- 

 nae not elongated, basal three joints yellow, fourth joint yellowish-brown, 

 outer joints brown, pubescence pale and rather long, joints cylindroidal, basal 

 whorls of three to five setaceous hairs, the latter long. Occiput shining; an 

 obscure, brownish spot each side of base of neck. 



Thorax opaque above, yellow. Pronotal scutum brownish in the middle. 

 Mesonotal stripes yellowish-red, the middle stripe wider and somewhat shining 

 anteriorly, divided by a yellowish median line; all the stripes slightly darker 

 along their margins. Transverse suture not tinged with black. Scutum, 

 scutellum and postnotum ocherous, with some luster. Pleura ocherous with 

 a. feeble, whitish pruinosity. Halteres sordid yellow, club pale brown. Legs 

 yellowish, slender, metatarsi longer than the tibiae; outer tarsal joints infus- 

 cate. Wings with yellow tint, costal cells and costo-apical part of wing beyond 

 the stigma, deeper yellow; stigma dark brown; veins almost entirely glabrous. 



Abdomen sordid yellow, somewhat shining, some obscure dorsal spots, lateral 

 and ventral rows of black spots. Eighth sternite with deep, V-shaped incision, 

 the edges of which are fringed with long, golden-yellow hair. Hypopygium 

 concolorous; the ninth tergite wider than long, tumid each side, the two sides 

 divided by a deep furrow which widens anteriorly and ends posteriorly at the 

 base of the deep, triangular emargination of the posterior margin, each side 

 acutely-triangular at the apex; outer appendages lanceolate, attenuate and 

 incurved apically, the inner appendages are slender, twisted, rod-like, com- 

 pressed in basal half and directed outward; the rod-like appendages of the 

 penis-guard are strongly marked, claw- like. 



Holotype: c? ; Four Mile Run, Virginia. July 24, 1915. 

 (C. P. Alexander.) 



Paratypes : three males. Pollochsville, North Carolina. July 8, 

 1915. (C. P. Alexander.) 



