224 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



33. No blackish tinge at lateral ends of transverse suture; thoracic stripes 



poorly defined >^"^ 



A blackened area at lateral end of transverse suture; thoracic stripes more 

 clearlv indicated •^S 



34. Orange; abdominal tergites with lateral rows of black spots xanthostigma 



Testaceous to f errugineous ; abdominal tergites with a lateral stripe, the 



segments banded posteriorly with black cingulata 



35. Abdomen with dorsal and lateral rows of black spots ■ .obliterate 



Abdomen with lateral stripes; tergites banded posteriorly with black 



wyalusingensis 



36. Wings with cells C and Sc hyaline ; stigma subfuscous abbreviata 



Wings with cells C and Sc infumed; stigma yellowish brown - .suturalis 



37. Antennae with 13 segments 38 



Antennae with 16 or more segments 41 



38. A black spot before anterior end of each lateral praescutal stripe. . .clandestina 

 No such darkened marks on praescutum 39 



39. Lateral and posterior margins of abdominal tergites black . .approximata 



Abdominal tergites with lateral rows of black spots 40 



40. Flagellar segments excised beneath ; abdominal tergites with median row 



of spots breviorcornis 



Flagellar segments cylindrical; abdominal tergites with a continuous dark 

 stripe stigmatica 



41. Antennae ( $ ) 19-segmented eucera 



Antennae ( S ) with 16 or 17 segments 42 



42. Stigma yellowish brown ; wing-apex not darkened • • euceroides 



Stigma dark brown ; wing-apex distinctly darkened polymera 



Nephrotoma abbreviata (Lw.) 



1863. Pachyi^rhma ahhreviofa Loew; Berlin. Ent. Zeitschr., 7:295. 



Occiput oraiifre; brand of moderate size, shiny, concolorous; palpi 

 pale; antennae yellow, flafirellar segments darkened basally. Thoracic 

 stripes ochraceons; ends of suture black. Wings hyaline; stigma sub- 

 fuscous; apex infuscated. Abdomen variegated with black, the me- 

 dian area larger trigonal, lateral areas minute. 2. L. about 11-12 

 mm. ; w. 11-12 mm. 



Miss. (Austral). Recorded by Dickinson (1932) from Wise, probably in error. 



Prof. Rogers considers this as very po,ssibly being a member of the 

 ferruginea complex of forms and only doubtfully distinct from fer- 

 miginea. 



N. altissima erythrophrys (Will.) 



1877. Pachyrrhina altissima Osten Sacken; Bull. U. S. Geol. Surv., 



3:210. 

 1893. P. eri/throphrys Williston : Kansas Univ. Quart., 2 : 63. 



Fig.— Dickinson, Cfls. Wise, p. 216, ng. 118 (wing) ; 1932. 



Typical form almost entirely black, sides of posterior vertex ob- 

 scure reddish. Form ej^yfhropliri/s with more reddish coloration, es- 

 pecially the basal abdominal segments; terminal segments entirely 

 blackened. $. L. 9-11 mm.; w. 8-10 mm. 5. L. 16-18 mm.; w. 11- 

 12 mm. 



(June, July) Rocky Mt. Reg., Aha. to N. M., eastw. to Minn., Wise, 111. and Mich.; 

 Man. and w. Ont. (Hudsonian, high Canadian). 



