No. 22.] HYMENOPTERA OF CONNECTICUT. 543 



23. Marginal vein short, first abdominal segment narrow, petiol- 



iform Caloteleia p. 554 



Marginal vein long, first segment of abdomen quadrate 

 or nearly so Baryconus p. 554 



24. Abdomen very long, second, third, and fourth segments 



nearly equal Macroteleia p. 554 



Abdomen not so long, oblong-oval or fusiform. .Cacellus p. 555 



25. Mesonotum with parapsidal furrows 26 



Mesonotum without furrows 29 



26. Postscutellum spined Opisthacantha p. 555 



Postscutellum not spined 27 



27. Marginal vein longer than stigmal vein 28 



Marginal vein less than half length of stigmal vein 



Caloteleia p. 554 



28. First joint oi^flagellum scarcely longer than third 



Macroteleia p. 554 

 First flagellar joint much longer than third. . .Baryconus p. 554 



29. Marginal vein longer than stigmal vein Baryconus p. 554 



Marginal vein shorter than stigmal vein 30 



30. First joint of flagellum very long Caloteleia p. 554 



First joint of flagellum shorter than second Cacellus p. 555 



31. Females 32 



Males 44 



32. Mesonotum with parapsidal furrows 33 



Mesonotum without furrows 36 



33. Mesonotum with two furrows 34 



Mesonotum with three furrows Hoploteleia p. 555 



34. Metathorax unarmed 35 



Metathorax with two teeth Cacellus p. 555 



35. Mandibles tridentate Macroteleia p. 554 



Mandibles bidentate Caloteleia p. 554 



36. Postscutellum simple 37 



Postscutellun armed with a spine Opisthacantha p. 555 



37. Abdomen without a horn at base above 39 



Abdomen with a horn at base above 38 



38. Marginal vein short Caloteleia p. 554 



Marginal vein long Baryconus p. 554 



39. Abdomen broadly oval, sessile, antennal club 6-jointed 



Hadronotus p. 555 



Abdomen long, fusiform, club of antennae 6-jointed 



Cacellus p. 555 



40. Submarginal vein ending in a stigma 4 1 



Submarginal vein not ending in a stigma Idris p. 555 



41. Head normal, without a frontal lamina or ledge 43 



Head with a projecting frontal lamina or ledge 42 



42. Scutellum quadrate, its posterior angles acute, postscutellum 



with a large erect spine Acanthoscelio 



