NO. 187. NORTH AMERICAN DIGGER WASPS— FERNALD. 405 



Wings. — Yellow hyaline, .somewhat fuliginou.s along the outer mar- 

 gins and quite dark yellowish-brown near the base; cubital vein of the 

 hind wing frequentl}'^ bent backward slightly near its middle, obsolete 

 beyond the transverse cubital which seems to be a part of it rather 

 than a cross vein; from the middle of the backward bend is a shadow 

 as of an obsolete vein running outward and backward; transverse 

 median vein nearly straight, about at I'ight angles to the median vein; 

 tegulw brownish-black behind, black in front, with a few minute punc- 

 tures on the anterior portion; more or less refiexed on the margins. 



Legs. — Black; coxa\ trochanters and outer side of the femora with 

 black hairs; fore metatarsi with ten or eleven comb teetii more or less 

 alternating with spines; hind tibife with the inner contour straight 

 except for a slight, elongated enlargement near the base; claws slighth' 

 lighter colored in the middle. 



Male. — Differs from the female as follows (taken from Kohl, as 1 

 have not seen this sex): Clypeus more strongl}- arched, its anterior 

 margin truncate, without a reffexed edge; lifth, sixth, seventh, and 

 eighth ventral abdominal plates with a thick clothing of brownish 

 hairs. 



Length. — Females, 28-34: mm.; males, 28-31 mm. 



Specimens of this large species have been captured in Mexico, North 

 Yucatan, British Honduras, Guatemala, Costa Rica, Panama, Vene- 

 zuela, and Brazil, according to Kohl. Those 1 have seen were taken 

 in Mexico, Santo Domingo, and Brazil, and one specimen taken Feb. 

 2, 1906, at Grenada, West Indies, which has the wings darker and 

 more brownish than usual. 



CHLORION (PROTEROSPHEX) PENSYLVANICUM (Linnaeus). 



Spliex pensylvanica Linn^us, Centur. Ins. rar., 1763, p. 30 (not seen). 



Sphcx pensylvanica Linn^us, Amoen. acad., VI, 1763, p. 412 (not seen). . 



Sphe.v pensylranica Linnaeus, Syst. Nat., 12th ed., I, 1767, p. 941. 



Sphex pensylvanica De Geer, Mem. Hist. Ins., Ill, 1773, p. 586, pi. xxx, tig. 2 



SpJtex pensylvanica Fabricius, Syst. Ent. ,1775, p. 346. 



Pepsis pensylvanica Fabricius, Syst. Piez., 1804, p. 211. 



Sphex pensylvanica Patton, Proc. Bos. Soc. Nat. Hist, XX, 1880, p. 383. 



Sphex pensylvaninis Kohl, Ann. natur. Hofmus. Wien, V, 1890, p. 418. 



Large, robust insects; body and legs black; hairs ])lack; wings 

 strongly fuliginous, with a Ijluish or violet reflection; pubescence gen- 

 erall}' absent, silvery when present. 



Le77iale.—}iesid broad, quite quadrangular from above, the cheeks 

 being full; clypeus strongly arched, its anterior margin evenly 

 rounded, slightly reflexed, with a pair of very short, broad lobes at 

 the middle; its surface coarsely punctured, with many, long, stout 

 hairs, and in some cases with traces of silvery pubescence at the sides 

 below the eyes; frons rather less coarsely punctured, quite smooth 

 between the base of the clypeus and the anteniue; with rather shorter 



