350 Annals Entomological Society of America [Vol. V, 



on either side of the median notch, produced ventrad into a small 

 spine. The apical appendage is dorsal ; the caudal margin is rather 

 straight, the outer upper angle produced dorsad into a chitinized tooth 

 which is slightly bifid at its apex, the chitin continuing down the 

 anterior side of the appendage in a narrow line ; the inner margin of the 

 appendage straight, with scanty long hairs which cross over the median 

 space and meet those of the other side. Between the chitinized teeth, 

 on the median line, is a pale, horse-shoe shaped organ which probably 

 surrounds the penis which is not exserted in my single specimen. 



Holotype, d', Chapada, Matto Grosso, Brazil (H. H. 

 Smith, coll.) 



Type in Am. Mus. of Nat. Hist., New York. 



The specific name is derived from a native tribe. "The 

 central parts of Matto Grosso at the foot of the plateaux are 

 occupied by the Guatos, some of whom are still in the wild 

 state." Reclus, Universal Geography, Vol. XIX, p. 258. The 

 latest and best account of this tribe is by Dr. Max Schmidt, 

 "Reisen in Matto Grosso in Jahre 1910."* 



Tipula smithi, sp. n. 

 Light brownish-yellow; costal margin of wings brown. 

 9 Length, about 13 mm.; wing, 12.8 mm. 



Head: Anterior prolongation of the front, short, light greyish- 

 brown; palpi light bro^\'n. Antennae, first eight segments clear light 

 yellow, the apical segments gradually suffused with brownish. Front, 

 vertex and occiput greyish-brown. Thorax: Mcsonotimi, jirasscutuni 

 light brown without apparent stripes; scutum similarly bro\\Ti; scutel- 

 lum and post-notum light yellow. Pleurffi yellow wnth a pearly-grey 

 bloom. Haltercs light brown. Legs: coxae yellowish with a grey 

 bloom; trochanter light yellow; rest of legs gone. Wings: Nearly 

 hyaline; stigma rounded, dark browTi; the costal margin sviffused vnth 

 brown, the brown pattern including cells C, Sc, the cephalic half of R 

 (where it becomes paler, more yellowish); basal third of cell 1st Ri; all 

 of cell 2d Ri; cell R-.; cell R3, except a hyaline spot in the proximal end 

 and another o\'er the middle of vein Rj+5; brown clouds at origin and 

 tip of cell Rs; along basal deflection of Cur, along cross- vein m; at fork 

 of Mi+2, and at the ends of the longitudinal veins. Venation: (see Fig. 

 f) ; cross-vein r about as long as that portion of R2 below it ; R3 short, 

 about twice as long as R2; basal deflection of R1+5 long, almost oblit- 

 erating cross-vein r-m; petiole of cell Mi almost as long as that cell; 

 fusion of Ms and Cui extensive, not quite as long as cross-vein m. 



Abdomen: Tergites brownish-yellow; steniites clearer yellow; sec- 

 ond segment very long, as long as 3 and 4 combined; 9th tergite with 

 caudal margins concave (see Figs, w, wi), the caudo-lateral angles 



♦Zeitschrift fur ethnologic; vol. 44, pt. 1; p. 130-174; especially, p. 131-137; 

 (1912). 



