A-^rrc Species of Sierola, With B-vplaiiatory Notes. 71 



325-326 Head widest across the eyes, narrowing be- 

 hind and in front, segments of the anten- 

 nae throughout longer than wide 161. langfordi 



326-325 Head with the lateral margins parallel, not 

 converging behind the eyes, segments of 

 the antennae not longer than wide 

 throughout 



327-328 Head longer than wide by a half, punctua- 

 tion coarse, hairy 162. aspera 



2i2%-227 Head only a little longer than wide, punctua- 

 tion fine, hairy clothing inconspicuous 163. atra 



329-324 Mandibles slender 



330-331 Head as wide as long 164. newelli 



331-330 Head longer than wide 



332-335 Head widest across the eyes, narrowing be- 

 hind and in front 



33>2>-ii4 Head considerably longer than wide, vertical 

 margin straight, mandible touching the 

 eye at the base, abdomen ovate 165. waianaeana 



32>4-?ti3, Head only a little longer than wide, vertical 

 margin slightly convex, base of the man- 

 dible not reaching the eye, abdomen 

 short ovate, apically acuminate 166. distingucnda 



335-332 Head with the lateral margins parallel, not 

 converging behind the eyes 



3>3(>-2>3>7 Mandibles marked with red, nearly but not 

 quite reaching the eye at the base, me- 

 dian groove of the gula nearly effaced, 

 propodeum rugulose 167. nifoitniiuiibiilota 



337-336 Mandibles black, touching the eye at the 

 base, gula with a shallow depression 

 along the median line, propodeum deli- 

 cately sculptured 168. curiosa 



338-321 Opaque, not at all shining 



339-340 Head longer than wide by a half, clothed 



with long silvery hairs 169. suhcrispa 



340-339 Head as wide as long or nearly so, hairy 

 clothing short and inconspicuous 



341-342 Head a little longer than wide, only the pedi- 

 cel and first three funicle segments of 

 antennas longer than wide, mandibles 

 slender, wings with fuscous pigmentation 170. nuda 



342-341 Head as wide as long, narrowing behind the 

 eyes, width between the eyes nearly 

 twice the length from eye to vertex, an- 

 tennal segments throughout considerably 

 longer than wide, mandibles stout, wings 

 with a yellowish brown pigmentation 171. willardi 



