G. C. DAVIS. 267 



28. Edge of anteiiiial grooves elevated. ~9. 



Edge of auteniml grooves not elevated 30. 



29. Upper edge of antenual grooves raised «Otitocliilnx Foer. 



Inner edge of anteunal grooves raised •• SymbeetliiiS Foer. 



30. Clypeus with two small teeth at apex »]\>Ieges Foer. 



Clypeus not as ahove 31. 



31. Teeth of mandibles of equal length ; thyridia distinct Tryplioii Grav. 



Lower tooth of mandibles the longer; thyridia small and indistinct. 



• Polyrlij'sia Foer. 



32. Humeral cross-nervure broken above the middle 33. 



Humeral cross-nervure broken at or below the middle 38. 



33. Basal segment of abdomen with four strong tubercles back of the middle. 



*Bfarcopcea Foer. 

 Basal segment without tubercles back of middle 34. 



34. Lower tooth of mandibles longer than upper 35. 



Lower tooth not longer than upper ; clypeus impressed, or with a marginal 



front edge 3(5. 



35. Metauotum without superior or apical median areas; clypeus with a small 



cross- furrow close to the front edge, which is raised and small. 



' I sod i set a Foer. 



Metanotum with an apical median area which is divided by a median carina; 



clypeus without cross-furrow ■Keales Foer. 



36. C'lypeus nmch impressed from the base and hollowed dish-shaped 37. 



Clypeus sloping back of middle, transversely impressed in front; the front 



is strongly and broadly elevated, emarginate medially; segment 1 

 smaller at base than between the spiracles, from these a ridge extends 

 to apex ; apical area with sharp carinse Zacalles Foer. 



37. Segment 1 not broader at the outer base than between the spiracles, and from 



there a fine ridge extends to the tip ; antennae with white annulus. 



• Perispuda Foer 



Segment 1 broader at outer base than between the spiracles; no ridge from 



spiracles to apex ®Za pletliiK Foer. 



38. Mandibles truncate at tip and without teeth "Alcoeliera Foer. 



Mandibles plainly toothed at apex 39. 



39. Areolet not petiolate 40. 



Areolet plainly petiolate 42. 



40. Areolet neither plainly petiolate nor sessile 41. 



Areolet plainly sessile ; mesonotum with deep parapsidal furrows anteriorly. 



Apiineles Foer. 



41. Mesonotum with short parapsidal furrows anteriorly; clypeus not broader 



than long; head transvei'se : humeral cross-nervure broken at about 

 the middle; lunulse on segments 2 and 3 very plain. 



-liSepserus Foer. 

 Mesonotum without parapsidal furrows; clypeus broader than long; head 

 not transverse; humeral cross-nervure broken far below the middle. 



EpaclltlieM Foer. 



42. Segment 3 longer than broad »I^agaroti>* Foer. 



Segment 3 not distinctly longer than broad 43. 



43. Mesopleura with a projecting tooth to the l)ack a;id below. ■DHspleJi^ Foer. 

 Mesopleura without posterior projecting tooth 44. 



TRANS. AM. ENT. SOC. XXIV. SEPTEMBER, 1897. 



