WILLIAM G. DIETZ 111 



42. Occiput entirely shining 43 



Occiput opaque with a shining triangular spot 46 



43. Cord clouded unifasciata Loew 



Cord not clouded 44 



44. Front and occiput unicolorous 45 



Front and occiput with a black stripe occipitalis Loew 



45. Head yellow; thoracic stripes well defined sodalis Loew 



Head dark ferruginous; thoracic stripes ill-defined. 



sodalis nictans subsp. n. 



46. Ends of thoracic suture black 47 



Not as in the alternative 50 



47. Cells C and Sc fuscous, stigma very slightly infuscate. 



costomarginata spec, n! 

 These cells pale, stigma yellowish-fuscous 48 



48. Abdominal tergites conspicuously marked with dark fuscous or blackish; 



the eighth sternite not deeply emarginate 49 



Markings inconspicuous or obsolete; the eighth sternite deeply emarginate. 



occidentalis Doane 



49. Abdomen with dorsal row of blotches or spots; the inner apical appendage 



not prolonged into a slender process f erruginea Fabricius 



Latero-posterior margins of abdominal tergites black; the inner apical 

 appendage prolonged into a slender, style-like process; a black 

 dot above each eye beutenmuelleri spec. n. 



50. Stigma brownish-yellow occipitalis Doane 20 



Stigma blackish-brown gracilicornis Loew 



51. Flagellar joints black at the base 52 



Flagellar joints yellow at the base 58 



52. Occiput shining 53 



Occiput opaque with defined shining triangle 56 



53. Outer portion of transverse suture not tinged with black; thoracic stripes 



ill-defined 54 



Not as in the alternative 55 



54. Yellow; abdomen with lateral rows of black spots. . xanthostigma Loew 

 Ferruginous; abdomen with lateral stripes and segments posteriorly, 



banded with black cingulata spec. n. 



55. Abdomen with dorsal and lateral rows of black spots; wings pubescent. 



obliterata spec. n. 

 Abdomen with lateral stripes and segments banded posteriorly with black. 



wyalusingensis spec. n. 



56. Cells C and Schyaline. . . 57 



These cells colored; stigma yellowish-brown suturalis Loew 



57. Stigma subfuscous; abdomen with three rows of black spots. 



abbreviata Loew 



Stigma almost hyaline; abdominal tergites two to five with two pale, 



fuscous lines; thoracic stripes broad lativittata spec. n. 



20 1 here follow Prof. Doane; the occiput varies from shining to subopaque. 



TRANS. AM. ENT. SOC., XLIV. 



