462 Annals Entomological Society of America [Vol. VI, 



appear as a fascia, might merely be looked upon as a spot 

 by another and vice versa-. Under the heading, "Wings 

 Spotted," species may have been included which might with 

 equal propriety have been placed under "wings unicolorous" 

 and the reverse. Whenever I have been conscious of such being 

 the case, I have endeavored to remedy the difficulty by 

 cross-references. To those who expect this synopsis to be 

 an easy road to the goal, disappointment will come. To 

 determine the relative position of a given form and then by 

 close study of the original description and whenever possible, 

 of the type, the student should be enabled with certain limita- 

 tions, to determine whether a given form is described or not. 

 To the critic this paper will furnish a rich field, more so perhaps, 

 than the time and labor bestowed upon it should warrant. 



Following the synopsis, I have added a list with habitat 

 and bibliography of these species not contained in Prof. Aldrich's 

 catalogue. 



1 . Wings normal in size in both sexes 2 



Wings reduced in size, or vestigial, at least in the female 165 



2. Wings spotted or striped 3 



Wings unicolorous; at most, costal margin and stigma fuscous, or a 



white, hyaline spot before the stigma, more rarely another behind it; 

 veins may be margined with fuscous 87* 



3. Wings spotted, marbled or clouded 4 



Not as above, but. the costal margin, fifth longitudinal vein and pos- 

 terior cross-vein more or less broadly margined with fuscous, apex of 

 wing frequently iinfuscate; generallv a pale hyaline vitta in the second 

 basal cell ' 79 



4. With pale transverse fascia 5 



Without such a fascia 24 



5. Wings conspicuously variegated with dark fuscous 6 



Wings not, or inconspicuously variegated with fuscous 15 



6. Fascia behind the stigma 7 



Fascia before the stigma 10 



7. Facia angulate , 8 



.' Fascia not angulate 9 



-,;S. ' Joints of flagellum bicolorous. Yellow, thoracic vittae gray; abdomen 

 with dorsal stripe, ninth tergite narrowly emarginate in the middle; 

 with two, rather sharp teeth from the middle of the posterior margin, 

 lateral angles produced; ninth sternite very deeply and broadly 

 divided; pleural plates distinct. Length 12-13mm. Eight sternite 



entire. .- angidata Loew 



Joints of flagellum unicolorous. Mcsonotum with about six fuscous, 

 somewhat irregular lines, the middle pair more widely separated 

 anteriorly; abdomen trivittate; eight sternite entire; hypopygium 

 medium-sized, ninth tergite with rather broad V-shaped emargina- 

 tion, its margin with several teeth; ninth sternite with V-shaped emar- 

 gination; pleural plates distinct. Length 14-23 mm trivittata Say 



*There may be an indistinct fuscous spot over the origin of the praefurca. The 

 whitish spot before the stigma is called ante-stigmal spot, in the text. 



