AMERICAN IlYMEN'Ol'TERA. 139 



Gastrocoeli subobsolete; the yellow band on fourth segment entire; 



size small '.»?.. poinilius. 



Base of segments 2 — 4 black, apex yellow, tips of lirst segment yellow. 



Large; pale orbital lines entire 87. Iliuiiifieiis. 



Medium; pale orbital lines interrupted posteriorly 88. Isctiii^. 



Small; pale orbital lines interrupted posteriorly 'Jl. parvus, var. 



Apex of abdomen black margined with white or yellow. 



Mesothorax black, immaculate ; abdomen broad, black with yellow or whitish 



bands 94. iliirizouutus. 



Mesothorax black, with median yellow s]wt; abdomen narrow, black, with 



yellow bands 'JO. zebrafiis. 



Mesothorax black, with two longitudinal yellow lines; abdomen narrow, 



slender at base, yellow with black bands itfi. <'<>inptii$$. 



Mesothorax fulvous, with two longitudinal yellow lines 9:>. <Iit*tiOi>iUS. 



Apex of abdomen fulvous, sometimes marked with white or yellow. 

 Antennae without pale annulus. 

 Postpetiole aciculated. 

 Segments 6 and 6 black, 7 fulvous. 



First segment entirely black 98. iii<>oii««fans. 



First segment black, yellow at tip 99. iuC'ucutus. 



Segments 5 — 7 more or less fulvous or ferruginous. 

 Posterior femora black. 

 Abdominal segments one to three black, with yellow band at apex 



of each UY.i. xclotypiis. 



Abdominal segments two to five yellow or fulvous, narrowly black 



at base 104. creperus. 



Abdominal segments varied with yellow, ferruginous and black, seg- 

 ments 2 and 3 more or less yellow at base 105. varicgatus. 



Posterior femora fulvous. 



Mesothorax black or ferruginous 106. fiirotci* 



Mesothorax black, with two yellow stripes 107. dclicatus. 



Postpetiole j)uncturod 89. miiuicus. 



Antennte with pale annulus. 



Post])etiole aciculated; ajjical segment fulvous 104. creperns, var? 



Postpetiole punctured ; ajdcal segment white 110. Ileiligbrodti. 



Postpetiole smooth and polished; apical segments fulvous. 



Posterior femora black 108. parattlS. 



Posterior femora fulvous 109. viiiuulus. 



Section IV. — Abdomen fulvo-ferruginous, apical margins of sef/mcnts 1 — 4, arid 

 terminal scijment, yellow 11 1. IiOllCStu!^. 



Section V. — Abdomen bright mffron-ycllow , the three or four apical segments black ; 

 legs entirely yellow 112. niilvus. 



Section VI. — Abdomen more or less ferruginous, apex alionys black. 

 Segment 3 ferruginous at base, remaining segments black; wihljs subhyaline; 



face, scutellum and legs yellow Ambly. Quebecensis, var. 



Segments 2 — 4 more or less ferruginous. 

 Wings fuliginous. 

 Posterior legs black. 

 Scutellum black; the second and third segments of abdomen pale fer- 

 ruginous Ambly. magnus. 



