130 NORTH AMERICAN TIPULIDAE 



tuberosity marked; a narrowly triangular, shining, occipital spot, scarcely 

 darker than the surrounding color, an obscure dark line extends from the 

 anterior end of the occipital spot to summit of the frontal tuberosity. 



Thorax concolorous, dorsum, except the stripes, opaque, the latter highly 

 polished, yellowish-red, the middle stripe narrowed posteriorly, narrowly 

 margined ferruginous, a fuscous spot at the posterior end; lateral stripes rather 

 wide, curved outward anteriorly, narrowly margined ferruginous on inner 

 margin. Scutum with the exception of middle stripe shining, the latter with 

 a fuscous spot at its base; a diffused yellowish-red stripe each side. Scutellum 

 ferruginous, polished. Postnotum yellowish-red along the middle, shining, 

 sides yellow, outer part of transverse suture and posterior end of pleuro-dorsal 

 suture, black. Pleura light yellow, shining. Halteres sordid yellow, basal 

 half of club brown, apical part yellowish-white. Legs slender, yellowish; 

 femora and tibiae infuscate at the apex, the latter about as long as the meta- 

 tarsi, tarsal joints fuscous; pubescence very short, sparse, blackish. Wings 

 slightly fuscous, costal cells brown, stigma very pale fuscous; veins brown> 

 vein C and Sc almost black. Cell M 1 sessile. Veins C, Sc, R and its 

 branches and veins M 1 - 2 and 3 setulose. Venation as in figure. 



Abdomen yellow, tergum with a pale fuscous spot each side of base, sternites 

 two to five, each with a large, fuscous spot; eighth sternite rounded at the 

 apex and fringed with long, yellow, silken hair. Hypopygium yellow; ninth 

 tergite a little wider than long, longitudinally impressed in front, narrowly 

 emarginate in the middle of the posterior margin, sides rounded; outer append- 

 ages paler, lanceolate. 



Holotype: cf ; Bradentown, Florida. March. (M. C. Van 

 Duzee.) 



In its fuscous flagellum, shining occipital spot and the outer 

 part of the transverse suture tinted black, this species is allied to 

 P. ferruginea, occidentalis and beutenmuelleri, from all of which 

 it differs in the brown costal cells of the wing. In the single 

 specimen before me, vein R 4and5 is peculiarly curved. 



Pachyrhina beutenmuelleri spec. n. (PL V, fig. 14.) 



Similar to ferruginea Fabricius. Flagellum unicolorous, blackish. A brown 

 spot each side of vertex. Latero-posterior margins of abdominal segments 

 black. The inner appendages of the hypopygium end in a style-like process. 



Male. Length, 10.5 mm.; wing, 10.5 mm. 



Head. Frontal prolongation shining, nasus long, beset with black hairs. 

 Proboscis very short; mouthparts dark brown; basal joint of palpi dark yel- 

 low, brown at apex, following joints yellowish-fuscous. Face pale yellow. 

 Antennae moderately long, the three basal joints reddish-yellow, the third 

 joint infuscate apically, the rest of flagellum blackish, pubescence very fine, 

 white; segments cylindroidal, enlarged at base with a whorl of but three or 

 four black setae. Front and occiput opaque, orange-yellow, tuberosity promi- 



