444 l■^\.Mll.^ \i. — si- Ai-m i.ixid.i:. 



iiio- processes or laciiiiu' of varying shape, frequently long and slen- 

 der and deeurved. I'esenihling somewiiat the foreeps of an earwig, 

 often broader in tlie foi'in of triangular plates. The sixth segment 

 varies also in lorin nwi] si-ulpturc the hind mai'gin being notched in 

 most species and the surface concave or impressed, the impression 

 often wholly or ])artly filled with very short, stout bristles, thus 

 forming a "spongy space." The hind mai'giii ol' the sixth ventral 

 in part of the species is also pectinate or fringed on each side with 

 stiff, close-set s])inul(^s. thus forming a coml)-like structure. 



In the female the front tarsi are not dilated and the last ventral 

 is (flf) either entire and fringed behind with short equal spinules 

 (/lavipennis and (■>rciinicincf}is only) or {h) divided into six rather 

 long and slender processes. In the latter case the last dorsal is tri- 

 lobed, with the middle lobe either entire, emarginate, bifid or trifid 

 at apex. In the k'ey the characters given pertain oidy to the male, 

 uidess the female b(^ mentioned specifically. 



KEY TO INDIANA SPECIES OF TACHINIS. 



<i. Sixth ventral pectinate on its hind margin. 



h. Si.xth ventral with a sitongy space on the center of the impression; 

 female with middle lobe of last dorsal shorter than the side lobes, 

 slender and feebly notched at tip. 849. memnonius. 



hi). Sixth vt'iitrnl wilhdut a si)ongy space at middle, very deeply emargi- 

 nate, the angles pmlonged. 

 c. Splmiles on hind margin of sixth ventral bordering the entire 

 emargination ; female with middle lobe of last dorsal as long as 

 the side lobes, deeply divided to form two slender processes; pic- 

 eous, the sides and base of thorax paler. 850. repandus. 



cc. Spimiles divided into three groups; pale reddish-yellow; length 



."..."» mm. SCRUTATOR. 



(/(/. Sixth ventral segment not pectinate on hind nnu-gin. 



'/. Form iiarallel; alidomen not narrowed except at tip; female as in 



)-Cp(nulu.S. PARALI.EU'S. 



(hJ. Abdomen gi-adnally narrowed from base to tiji. 

 c. Sixth ventral with a spongy space on its middle. 



/. Abdomen rather coarsely punctured; elytra clay-yellow; female 

 wilb last vend'ai I'ntire, last dorsal witli the three lobes united. 



851. FLAVIPENNIS. 



/'/. .Midonien very obsoletely ]Mmc(ured; female with middle lobe of 

 last dorsal as long as and broadei' than the side lobes, the ti]) 

 notciied one-third toward base. 852. H'lours. 



ft: Sixlb \-entral wiliionf a si)ongy space on its noddle. 

 //. first two \-enlrais si i-ongly earinate al middle. 



//. Processes of last ventral long and curved; last dorsal with 

 lour a<nle teeth; elytra ]>ale brown, their tips piceous ; fe- 

 nnde with middle l(,i)e broad, sliorter tlian side ones, and 

 triangid.arly notched at tij). 853. fimbriatus. 



