924 Charles Paul Alexander 



Genus Tricyphona Zetterstedt 



183S Tricyphona Zett. Ins. Lapponica, Dipt., p. 8511 



185G Amalopis Hal. Ins. Brit., Dipt., vol. 3, add., p. xv. 



1860 Crunobia Kol. Wien. Ent. Monatschr., vol. 4, p. 393. 



1869 Amalopis O. S. Mon. Dipt. N. Amer., part 4, p. 260. 



There are about forty known species in the genus Tricyphona. Almost 

 all of these are Holarctic in their distribution, but two occur in the 

 Australasian region. The carnivorous larvae live in moist earth. The 

 following key divides the local species: 



1. Cell M with a supernumerary cross- vein; wings heavily clouded and marbled with gray. 



[Amalopis hijperborea 0. S. Proc. Acad. Nat. Sci. Phila., p. 292. 1861.] (Plate 



XLII, 182.) T. hijperborea (0. S.) 



Cell M without a supernumerary cross- vein; wings with the markings sparse, confined 

 to the region of the veins 2 



2. Cell /?2 short-petiolate; costal margin of wings infuscated. [Amalopis inconstans 0. S. 



Proc. Acad. Nat. Sci. Phila., p. 247, pi. 3, fig. 32. 1859.] (Plate XLII, 177.) 



T. inconstans (0. S.) 

 Cell ^2 sessile ; costal margin of wings not infuscated 3 



3. Wings subhyaline or hyaline, unspotted 4 



Wings spotted or marked with darker 5 



4. Stigma of wings brown; male hypopygium conspicuously hairy; wings of female sub- 



atrophied. [Can. Ent., vol. 49, p. 30-31. 1917.] (Plate XLII, 179, 180.) 



T. autumnalis Alex. 



Stigma of wings pale; male hypopygium small, not conspicuously hairy; wings of female 



normally developed. [Amalopis calcar O. S. Proc. Acad. Nat. Sci. Phila., p. 247. 



1859.] '(Plate XLII, 178.) T. calcar (0. S.) 



5. Fusion of Cui with Ma extensive, subequal to the part of Ms before the cross-vein m. 



[Amalopis auripennis O. S. Proc. Acad. Nat. Sci. Phila., p. 247. 1859.] (Plate 



XLII, 181.) T. auripennis (0. S.). 



Fusion of Cu\ with Mi transient if present at all, usually less than one-half of the part 



of Mi before the cross- vein m 6 



6- Coloration of body light brown; m-cu obliterated by the fusion of Cui on Mz. [Proc. 

 Acad. Nat. Sci. Phila., p. 598-599, plate, fig. 1914.] (Plate XLII, 183.) 



T. katahdin Alex. 



Coloration of body gray; m-cu present 7 



7. Scape of antenna yellowish or brownish yellow, the flagellum much darker, brown; 

 abdominal tergites brown, the margins of the segments pale producing a banded appear- 

 ance; wings with large rounded clouds at the tips of the longitudinal veins and along 

 the cross-veins. [Amalopis vernalis O. S. Proc. Acad. Nat. Sci. Phila., p. 291. 1861.] 



(Plate XLII, 185.) T. vernalis (0. S.) 



Scape of antenna dark brown, concolorous with the flagellum; abdominal tergites brown, 

 imbanded; wings with the pattern almost obsolete, reduced to tiny dots and seams. 

 [Proc. Acad. Nat. Sci. Phila., p. 538-540 pi. 28, fig. 53. 1916.] (Plate XLII, 184.) 



T. paludicola Alex. 



In the local fauna, T. vernalis and T. paludicola are early spring species, 

 T. auripennis and T. calcar late spring species, and T. katahdin and T. 

 autumnalis late summer species. 



