AMKKICAN |i|I''l'KKA. 9 



covered with whitish-yellow pollen, the pile of nearly the same color. Pleurae 

 .shining hlack, with small patched of yellowish-white pollen. Abdomen slender, 

 wholly shining. Legs black, the front femora on the under side, the tip of middle 

 femora and more or less along the under side, the hind femora at tip, the four 

 front tibiae except the immediate tip and the hind tibise on rather more than 

 the basal half, light reddish-3'ellow ; hind femora much thickened. Wings on the 

 basal half light yellow, from the cross-veins blackish. 



Three specimens, Wa,sliinut(ni Territory. 



This species must be very siiiiihir to the specimen mentioned by Baron 

 Osten Sacken in his Western Diptera p. 288, from the White j\Its. 

 The hind femora are comparatively more thickened than in I), afhiiix. 



I.APIIYSTIA. 



7. I^iapliyxtia NCxfasciata. 



Dasi/pogon Ci-favialuH Say. J. Acml. I'liil. iii, .')0. I; ('oiiipl. W'r. ii. M : 



Wiedeman, Au.ss. Zw. Ins. i.4()S. OS. 

 Laphj/ctis sexfasciatus Qchiuer, Verb. Zool. Bol. Ges. 1.S66, (iStS. 

 Laphj/s/ia sexfusciata Loew, Berlin, Ent. Zeit. 1874: ."{73: Osten Sacken 



Cat. Dipt. ; Bigot, Bull, Soc. Ent. Fr. 1S79. ST. 

 Triclis notata Bigot, Annales Soc. Eiitnin. Fmnce. IS7S. 4i;.'! ; id. Bull. Soc. 



Ent. KS79, 87. 

 Laphyatia /niKfusciaia Bigot, ibid. Annales 1ST".). 2.>(!. 

 'I'lie genns Liii>hi/>^tiii is intermediate in position between the Daxi/po- 

 (/imiiKW and L'tjilirliiac. Our single authetiticated sjiecies seems to have 

 more affinity with Jjiijilii/xtin aiihuHrdln Lw. than with Ij<ti)lii/<tis <flii<iii- 

 trlld Lw. and may therefore remain in tliis oenus. In L. scr/dsridfa 

 tlie maruinal cell is not closed, but distinctly open. I have tlierefore 

 placed the oetitis under the Dasypouoninae. It resembles the followiuu' 

 s])ecies. but has a wider face, and open first posterior cell. 



TRICXllS. 



Loew, Bcnu'ik ulier d. Faui. Asil. 17 (18.51). GaslricheJius Koudani. 



8. TriC'liM tagax n. sp.— (Plate I, figs. B. (ia.) 



9 .—Black, whitish ixdlinose,: head wholly with light judlcn and pile: segments 

 of abdomen with a large semicircle in front and the anterior angles shining. 

 Wings hj'aline. Length 6V mm. 



Face thickly white pollinose, and with white hairs in the mystax, reaching 

 nearly to the antennae; straight on the sides, in profile gently swollen below. 

 Antennae black, fir.st and second joints short, of nearly equal length, third broad. nut 

 longer than the first two together; style very small, short. Front faintly brown- 

 ish ; occiput thickly white pollino.se on the sides; beard white. Thorax black, 

 the dorsum thickly covered with short yellowish-white recumbent pile, along the 

 middle in front a shining stripe: bristles slender, black. Pleurae thickly white 

 pollinose, with a small shining black spot above the middle coxae ; scutellum pilose 

 with a row of thin bristles along its edge. Abdomen short, moderately broad, 

 not much narrowed posteriorly; shining black, the posterior margins of the seg- 

 ments narrowly red, but obscured by the thick white pollen which leaves the 

 bhu'k to form a large .semioval sjKit. nearly reaching the hind margin in the 



THANS. AM1-:H. K.NT. SOC. XI. (.3) nKCK.MBK.H , 1 88.".. 



