242 PROCEEDIXGS OF THE NATIONAL MUSEUM. vol.53. 



based entirely on the types, and according to his characters the 

 female of packardii -svonld be a Pseudocrabro, while the male Avould 

 be a Ilypocrahro),, so it is evident they must not be considered as 

 distinct. Xylocrahro Ashmead {= group scaher Fox) is in habitus 

 rather different from Uypocrabro and can be well differentiated in 

 most species by the presence of a f oveolate channel on lateral posterior 

 angle of the propodeum, coarser sculpture, and absence of a fringe 

 at the side of the pj'gidium. In certain species, however (such as 

 hanksi Eohwer), there is intergrading {hanksi has habitus and punc- 

 tuation of Xylocrahro and other characters of Ilypocrahro), so it is 

 difficult to satisfactorily separate the' two groups. For this reason 

 the above synonymy is preferred. 



SOLENIUS (HyPOCRABRO) IMBUTUS (Fox). 



Crabro impntns Fox, Proc. California Acad., ser. 2, vol. 4, 1S94, p. 108. 

 Crabro (Solcnius Lepeletier) fcrntfflneipcs Rohwek, Ent. News, vol. 19, 

 lOOS, p. 2.30. 



From material in the United States National Museum it is evi- 

 dent that ferrugineipes Rohwer is only a color form of imhutus 

 Fox, in which the sternites are black, the spot on the first tergite 

 is wanting, and the spots on the second tergite are much reduced. 



SOLfeNIUS (HYPOCRABRO) NOKONIS (Rohwer). 

 Crabro (subg. ?) nnkonis Eohwek, Eut. News, IOCS, vol. 19, p. 251. 



This species is very close to ch7'y sat'ginus, hut may he distinguished, 

 as far as the material in the United States National Museum goes, 

 by the black metanotum and prepectus. 



SOLENIUS (HYPOCRABRO) GIFFARDI, new species. 



The female of this species runs in Fox's synopsis to packardii 

 Cresson, to which it is very closely allied, but it may be differentiated 

 from packardii by the richer livery, the shorter first flagellar joint, 

 and the less strongly ridged pronotum. The male runs to copulet 

 25 and differs from imhiitus in markings and sculpture and from 

 odyneroides by the marks on the sternites and shorter first joint of 

 the median tarsus. 



Female. — Length 11.5 mm. Clypeus with low median projection, 

 the lateral angles of Avhich are round ; distance between the eyes at 

 the clypeus about one-fifth greater than the median length of the 

 clypeus; frcns ^ery closely punctured, almost granular; vertex and 

 posterior orbits with the punctuation more distinct; ocelli in very 

 low triangle; postocellar line about one-eighth shorter than the 

 ocellocular line; first joint of flagellum one-fifth longer than the 

 second; pronotum not strongly ridged and without a lateral tooth; 

 mesonotum closely punctato-granular, posteriorly the punctures are 



