No. 64] DiPTERA or coxxecticut: TAxoNo^rv' 439 



2. Male hypopygium with the inner arm of inner dististvlc bitid ( Via 48 



C, E) : ..:....: 3 



Male hypopygium with inner arm of inner dististyle sinipk' (Fig. 48, H, D, !-" ) 4 



3. Male hypopygium with outer dististyle a very long slender rod. with onl\ 



three or four setae ; inner arm of inner disti.style very long and slender. 



the stem longer than the arms (Fig. 48, C) cognatella 



Male hypopygium with the outer dististyle stouter, fringed along margin 

 with several setae; inner arm of inner dististyle short, the stem stout. 

 shorter than the arms (Fig. 48, E) kansensis 



4. Outer dististyle a short powerful arm, dilated at apex, pnjvidcd with setae : 



gonapophyses with a marginal spine that is directed caudad (Fig. 48, I") 



reflexa 

 Outer dististyle a long, sinuous, chitinized arm, without setae ; gonapophyses 

 produced into strong, erect, chitinized points (Fig. 48, A, B. !)) S 



5. Gonapophyses small, the beak-like points feebly sclerotized; outer dististyle 



only slightly prolonged into an apical spine (Fig. 48, D) florens 



Gonapophyses appearing as powerful, straight, heavily sclerotized spikes ; 

 outer dististyle produced into a powerful acute spine (Fig. 48, A. B) armigera 



6. Wings with vein Rs shorter than R'2+::+-,, the latter nearly straight: K-,. short 



and straight (Fig. 47, K) (noveboraccnsis groui)) noveboracensis 



Wings with Rs subequal to or longer than the arcuated R^^i^t: A'.: longer. 

 gently sinuous (Fig. 47, J) (subcincrca group) 7 



7. Male hypopygium with the outer dististyle short and stout, at apex nearly 



truncate, sclerotized ; outer arm of inner dististyle entirely pale ( Fig. 49, 



j\ mainensis 



Male hypopygium with the outer dististyle slender, the apex not sclerotized 

 and only very obliquely truncated: outer arm of inner dististyle lieavily 

 blackened '^ 



8. Outer arm of inner dististyle obtuse and weakly bidentate at apex; gona- 



pophyses equal in size, pale throughout (Fig. 49, G) bidentata 



Outer arm of inner dististyle an acute spine; gonapophyses unequal in size, 

 heavily blackened 9 



9. Inner dististyle bearing two, or, in cases, three, blackened spines of various 



sizes, the outermost largest (Fig. 49, H) currani 



Inner dististyle a single powerful black spine, basal in position, with a more 

 slender outer pale spinous point (Fig. 49, J) subcinerea 



The male genitalia of the lueiiibers of the eognafe/io j:v()\\\) {Fi«r. 

 48) show several features in common. There are two dististyles, the 

 outer one simple but showing a considerable diversity of structure in 

 the different species. Inner style very complex, divided into two 

 principal arms, the longest of which is sometimes deeply split {cof/- 

 natella, kansensis), in the other local species simple. The longest arm 

 is strongly bent upon itself close to base and here is broken or frac- 

 tured. Gonapophyses paired, compressed, variously lobed on lower 

 margin. Aedeagus likewise compressed and variously lobed aiul 

 notched on margin. 



Gonomyia (6^onww?/m) armigera Alex. (Fig. 48, A, B). 

 19'2:i. Goiwmyia {Gonomijia) armigera Alexander: Occas. Fapers 

 Mus. Zool. Univ. Michigan, 127 : 4-5. 

 Coqnatella group ; rostrum and palpi black. Antennae with basal 

 seo-ments yellow; flagellum black. General coloration of mesonctum 

 light brown: pleura yellow, with a conspicuous dark brown longi- 

 tuVnal stripe.' Legs yellow. Abdominal ^^^^^^J^ 

 segments narrowly ringed caudally with yellow. Male h>p(.p>gnun 



(Fig. 48, A, B) . 5 . L. 4.8-5 mm. ; w. 4.5-a mm. 



(June) N. Y.. .s. Ind. 



