Mr. R. E. Turner on Fossortal Hymenoptera. 393 
Myxoderma platyacanthum rhomaleum, subsp. n. 
Differing from M. platyacanthum* (Clark) in having 
constantly broader and slightly shorter rays, slightly larger 
disk, much heavier abactinal and marginal spines, slightly 
shorter and decidedly heavier actinolateral spines, and shorter 
abactinal pedicellarie. R=100 mm., r=12°5 mm., R=8r, 
breadth of ray at base 13 mm.; at a little beyond base 
15°55 mm. Disk elevated, dome-shaped, rays very gradually 
tapered, but not attenuate distally. 
Type-locality.—Off Oregon (43° 46’ N., 124° 57’ W.), 
277 fathoms, grey sand; bottom temperature 42°2° Fahr, 
Known from off Oregon and Central California, 277 to 
296 fathoms, grey sand; 41°8° to 42°2° Fahr. 
XXXVII.—Notes on Fossorial Hymenoptera—XXXVII. On 
some Sphecine in the British Museum. By Row ann E. 
Turner, F.Z.S., F.E.S. 
Genus SCELIPHRON. 
Sceliphron masaicum, sp. n. 
9. Nigra, nigro-pilosa ; petiolo, tertio apicali nigro, trochanteribus 
posticis, femoribus posticis dimidio basali, tibiis posticis tertio 
basali, metatarso postico basi nigro, tarsisque posticis articulo 
secundo flayis; alis subhyalinis, flavo leviter suffusis, yenis 
nigris, alis anticis apice angustissime infumatis. 
Long. 20-21 mm. 
9. Clypeus very distinctly bilobed at the apex, closely 
punctured and clothed with long black hairs, which also 
extend over the whole head and thorax ; on each side of the 
bilobed central portion of the apical margin is a small tooth ; 
mandibles bidentate at the apex, the outer tooth the longest. 
Eyes distinctly nearer to each other on the vertex than on 
the clypeus ; second joint of the flagellum a little longer 
than the first and third combined. Pronotum deeply longi- 
tudinally grooved in the middle, finely punctured; meso- 
~ notum rugulose, scutellum and postscutellum closely longitu- 
dinally striated. Median segment with a deep and broad 
* Zoroaster platyacanthus, H. L. Clark, Bulli. Amer. Mus, Nat. Hist. 
vol. xxxii., July 9, 1913, p. 199, pl. xliv. figs. 1 & 2, 
