W. G. DIETZ 349 



Tipula ottawaensis spec. n. (Plate XIII, figs. 2 to 4; plate XIV, fig. 1.) 



Color yellowish; joints of flagellum yellowish fuscous, dark fuscous at 

 base; wing markings not very pronounced; bladelike processes of hypo- 

 pygium strongly curved in two planes. 



d 1 , Length, 13.5 mm.; wing, 15 mm. 



Anterior leg: femur, 9 mm., tibia, 10.5 mm., tarsus, 15 mm. 



Head yellowish; occiput grayish with median fuscous line or stripe and 

 short black hairs on each side posteriorly. Palpi pale sordid yellow, joints 

 1 to 3 increasing in length, second and third joints paler, fourth joint in- 

 fuscate towards the tip, the entire palpus clothed with short black scattered 

 hairs. Rostrum deeper yellow, nasus slightly infuscate and beset with black 

 hairs. Face creamy-white. Antennae long and slender, bent backward 

 they reach to end of scutellum, scape and basal joint of flagellum yellow, 

 the following joints passing from light yellowish-fuscous to light fuscous, 

 all dark fuscous at base and each with three to four basal setae, of about 

 one-half or three-fourths the length of the joint, joints of moderate thick- 

 ness, each slightly emarginate below, beyond the basal enlargement. 



Thorax: Collare pale cream yellow with median fuscous line. Mesono- 

 tum gray, lateral stripes concolorous and heavily margined with fuscous, 

 median stripe dark brown, wide anteriorly and gradually narrowed poste- 

 riorly to transverse suture and divided by a median gray line, the latter 

 narrow in its anterior third, wider and fusiform beyond; two ill-defined, 

 nearly circular spots each side behind the transverse suture; scutellum 

 yellowish-fuscous with darker median line. Metanotum yellowish gray; 

 the space between the lateral and median thoracic vittae is clothed 

 with moderately long fine whitish pubescence. Pleura pale yellow, gray- 

 ish-white pollinose ; a dark brown line on side of neck and extending upon 

 and ending in a dark brown spot on the lateral part of the pronotum; 

 Mesosternum somewhat infuscate below. Halteres pale; knob, except 

 apex, fuscous. 



Abdomen sordid yellow, becoming suffused with fuscous on posterior 

 part of tergum, with very distinct dark fuscous, median vitta, lateral 

 margin of tergum, except first segment, margined with fuscous, very nar- 

 rowly on second and third segments, becoming wider posteriorly, posterior 

 margin and extreme lateral edge of tergites 3 to 7 indistinctly paler; the 

 median vitta expands into a transverse line behind the anterior margin of 

 tergites 2 to 4. Eighth tergite yellow, infuscate along the middle; eighth 

 sternite fuscous in middle portion, lateral incisures short, lobes of nearly 

 equal width and fringed with short, coarse yellowish hair. Hypopygium 

 moderately large, shining, and with the exception of the middle portion 

 of the ninth sternite, dark brown. Ninth tergite longer than wide, narrowed 

 posteriorly and apical part clothed with short, coarse hair, from the under 

 surface of the apical margin project two pairs of blackish, downward 

 directed teeth; ninth sternite pale yellow inferiorly, broadly and deeply 

 emarginate in the middle, the emargination filled with a soft membrane; 

 from the posterior margin arise in close proximity the bladelike processes, 



TRANS. AM. ENT. SOC, XL. (25) 



