No.r.ii;.!. sy\0PSIS0PXE0rR0l'lCAKL]MSOtSJ.\.i:—M.i..\ \ \in.:;. 521 



Genus SIGMATOMERA Osten Sacken. 



^!(jmatomera Osten Sacken, Monogi-aphs, vol. 4, 1869, pp. 137, 13S. 

 11 first Mj distinct; brown cros.sband on the wing narrow, confined to the cord 



(Mexico) Jlavipennis Osten Sacken.' 



2. Cell first Mj not distinct (cross vein m obliterated); brown crossband broad; base 



and tip of the wing brown (Brazil) amazomca Westwood .* 



Xo roprcscndUivos of tliis ^(muis were includoci in the material 

 studiod. 



Genus GNOPHOMYIA Osten Sacken. 



Gnophomyia OsTES Sacken, Proc Acad. Nat. Sci. Phila., 1S59, p. 22,1. 

 Furina J^nnicke, Abhandl. Senckenb, Ges., vol. 6, 1S67, p. 318.— Osten 

 Sacken, Mouograph.s, vol. 4, 1S69, p. 172; Studies, etc., pt. 2, 1887, p. 198. 



KEY TO the SI'KCIES OP GNOPHOMYIA. 



1. Cross vein m absent aperta ('oquillctt' (S. W. Canada). ^ 



Cross vein m present 2. 



2. Wings uniform in coloration without dark f;isciK 3. 



Wings light colored with dark fasciae, or dark colored with white fasciae 9. 



3. Wings strongly tinged with blackish or dark brown, uniform 4. 



Wings subhyaline, or very slightly darker S. 



4. Halteres witli the knob yellow tristissima Osten Sacken* (Eastern U. S.). 



Haltercs entirely dark colored .5. 



5. Thorax black li. 



Thorax orange 7. 



6. Small species (length about 4 mm); wings infumed with violaceous; stigma 



brown nigrina Wiedemann' (Brazil). 



Larger species (lengtli about 0-7 mm); wings nearly black; costal cell darker; 

 no distinct stigma luctuosa Qsten Sacken (E. U. S. ; Cent. Am.) . 



7. -Vbdomen black rufithorax Wiedemann (Brazil). 



.\bdomcn orange ■. viagnijka, new species (Mexico). 



8. Dark nist red; wings uniformly tinged with brown, /errusmca Willistou'* (Mexico). 

 Greyish brown; wings very faintly tinged with brown; an indistinct hyaline 



cross band beyond the cord subhyalim, new species (Cent. Am., Brazil). 



9. Wings subhyaline with two brown fasciae 10. 



Wings brown with two subhyaline crossbands. 



cttloptera Osten Sacken' (Brazil, probably). 



10. Body, halteres and legs altogether black osten suckcni Sknse* (Brazil). 



Body light yellow, with brow^^ marks hirsuta. new species (Brazil). 



I have not included in the above table, Gnopliomyia (?) stupens 

 Walker' on the grounds that it is unrecognizable. In the original 

 description, the venation is compared to a Tricyphona, but Osten 

 Sacken says that it is a GnopTiomijia. No sj)ecies known to me has 



I .Monographs, Dipt. N. Amer., vol. 3, p. ix (supplement, Smiths. Mis«. Coll., No. 2.^0 (1S73)). 

 - Trans. Ent. Soc. Lond., ISSl, p. 366, pi. 17, fig. 3. 



Joimi. N. Y. Ent. Soc., 1905, p. .58. 

 ' Monographs, vol. 4, p. 17,i, pi. 2, lie .=> (wing): male and female. 



Auss. Zweifl. In.?., 182S, vol. 1, p. 37 iLimnobia). 



Biologia Centrali-Americana, Diptera, vol. 1 (supplement), Dec., 1900, p. 226, female. 



■ studies on Tipulidir, pt. 2, Berl. Ent. Zeit., 1857, pp. 199, 200, male and female. 



■ Osten Sacken, Idem, p. 200, female. 



» Trans. Ent. Soc. Ixmd., new set., vol. .5, 1660, p. 333 iLimmbia). 



