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 infuscate; generally 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 



8. Joints of flagellum bicolorous. Yellow, thoracic vitta? 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 angnlata 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. 



