124 



ilagellum of anteuuae reddish brown beneath; the last joint slightly 

 longer tlian broad, its apex bluntly rounded, narrowed at the base below. 

 Clypeus slightly but distinctly longer than broad, the top bluntly roun- 

 ded; the apex in the middle transverse or very slightly rounded inwardly, 

 the sides obiicpie. Apex of pronotum transverse, the sides projecting into 

 short stout teeth. Median segment short, its sides broadly rounded, the 

 middle depressed. Head above and pro-and mesothorax closely and 

 strongly punctured, the punctures more or less confluent. Metapleurae 

 closely, obliquely striated; the centre of metanotum less closely, more 

 strongly and irregularly striated. Head and thorax thickly covered with 

 white pubescence. First abdominal segment short, cup-shaped. 



Allied to 0. guadalupensis and 0. zonaius. 



3453 Nortonia nevadaensis sp. nov. 



Black; c]y]>eus, mandibles, except at the apex, an irregular mark on 

 either side of the j^ronotum, an irregularly oval one below the tegulae, 

 two marks on the apex of the scutellum and an irregular narrow line on 

 the apex of the first and second abdominal segments, sulphur yellow, as 

 are also the apex of the fore femora and the tibiae and tarsi. Wings 

 hyaline, the stigma fuscous, the nervures black. Tegulae dark fuscous, 

 Male. Length to end of second segment 6 mm. Taken in Ornjsliy county, 

 Nevada. 



Front and vertex closely rugosely punctured; the front in the middle 

 below with some longitudinal fine striae. Frontal keel stout, a small ye- 

 llow spot on either side near the top. Clypeus as long as its greatest width, 

 smooth, only very indistinctly punctured, its apical incision twice wider 

 than long, the sides forming distinct teeth. Apex of pronotum transverse, 

 the sides projecting into stout teeth. Basal half of mesonotum irregularly 

 punctured, the centre finely closelj^ rugose; the furrows distinct, mode- 

 rately deep; there is a shorter longitudinal furrow opposite the tegulae. 

 Propleurae rugose, finely closely longitudinally striated; the mesopleurae 

 coarsely rugose and finely striated above the furrow, smooth and more 

 rounded below it.; the metapleurae aciculated, finely closely obliquely 

 striated. Scutellum shining, flat, sparsely punctured. Postseutellum rai- 

 sed, coarsely rugosely punctured. Base of metanotum irregularly reticu- 

 lated; a depression narrowed towards the apex in the centre; the apical 

 slope not much depressed, the sides rounded, the centre furrowed. First 

 abdominal segment distinctly narrowed at the base, the basal slope obli- 

 que, irregularly sparsely weakly punctured, the transverse suture dis- 

 tinct, the apical parts strongly irregularly punctured; the longitudinal 

 furrow is deep; the yellow apical border is roundly raised. The second 

 segment is disinctly longer than wide, clearly narrowed and separated 

 from the first at the base; its ventral apex is bordered with yellow. 



I was at first inclined to refer this species to Syinmnrphni^, but after 

 comparing it with the description of Nortonia given by Saussure (Syn. 

 Amer, Wasps, p. 139) and by Dr. A. v. Bchulthess (zeits. f. Hymen, u. 



