IISrVESTIGATIOISrS ON THE MUTILLID WASPS 47 



32. Antennal scrobes bounded caudally by a delicate carina_cariniceps (p. 185). 

 Antennal scrobes not bounded caudally by a carina 33. 



33. Postero-lateral angles of the head bearing an oblique, elongate, subparallel- 



sided, glabrous tubercle directed outward toward the eyes 34. 



Postero-lateral angles of the head bearing a more or less prominent glabrous 

 tubercle, but either broadly triangular or subreniform in outline 44. 



34. Thorax blaclJ wileyae (p. 177). 



Thorax ferruginous 35. 



35. Head black, clothed more or less with ferruginous pubescence 36. 



Head entirely ferruginous 37. 



36. Abdomen entirely blaclj electra (p. 176). 



Second abdominal tergite with a pair of conspicuous pale yellow spots on 



the apical half nitidula (p. 174). 



37. Abdomen largely black, the second tea-gite maculated with two or four 



pale yellow spots 38. 



Abdomen largely ferruginous, the second tergite more or less conspicuously 



maculated with four pale ferruginous spots 41. 



.38. Second tergite with only two pale spots 39. 



Second tergite with four pale spots 40. 



39. Dorsal part of posterior face of propodeum with a thicli brush of long, 



coarse hairs ; distance between the tubercles on posterior margin of head 

 much greater tlian the least distance between the inner margin of the 



eyes curticeps (p. 173) . 



Propodeum without any such brush of hairs ; distance between the tubercles 

 on posterior margin of the head equal to the least distance between the 

 inner margins of the eyes biguttata (p. 171), 



40. Apical fringes of first, second, and third abdominal tergites blacli. 



atrifimbriata (p. 169). 

 Apical fringes of all the abdominal tergites silvery___quadriguttata (p. 157). 



41. Apical fringes of first, second, and third tergites blacli ; subapical margin of 



second tergite, and third tergite entirely (except narrow lateral margins of 



each), clothed with blacli pubescence alesia (p. 168). 



Apical fringes of all the tergites mostly pale ; occasionally the apical fringe 

 of the first tergite black, or apical fringes of second and third tergites 

 narrowly interrupted medially 42. 



42. Posterior margin of the head slightly concave, somewhat sinuate, the 



postero-lateral angles very prominent cypris (p. 165). 



Posterior margin of the head distinctly convex, the postero-lateral angles 

 somewhat prominent 43. 



43. Stri.",e of pysidium continuing to the apical margin internipta (p. 160). 



Striae of pygidium terminating considerably before the apical margin, the 



apical fourth or fifth smooth, unsculptured allardi (p. 166). 



44. Dorsal and posterior face of propodeum strongly asperated. 



chattahoochei (p. 186). 

 Dorsal and posterior face of propodeum foveolate or coarsely rugose 45. 



45. Apical fringe of first and second abdominal tergites black; posterior face 



of propodeum either almost bare, or with a thin brush of golden pube- 

 scence 46. 



Apical fringe of first tergite silvery; tliat of the second tergite black 

 medially; posterior face of propodeum with a thick brush of silver j 

 pubescence corcyra (p. 180) . 



