OF WASHINGTON, VOLUME XVIII, liilii 1 9M 



Mule. -Length 9.5 mm. Anterior margin nl' I lie clvpeus truncate, the 

 lateral angles rounded, its surface more closely punctured than the face; 

 face with large, distinct, separate; punctures: front with close, distinct 

 punctures; the inner margin of the eyes raised into elongate, narrow, 

 blister-formed elevation; vertex and posterior orbits with distinct, large, 

 separate punctures; fourth antennal joint about twice ;is wide as long, 

 about half as long as fifth and one-third longer than the third; teguLie 

 large, sparsely punctured anteriorly but closely punctured posteriorly; 

 mesonoturn with close, distinct, rather large punctures; mesoscutellum 

 truncate posteriorly, punctured like the mesoscutum; abdomen with 

 large, close punctures; these punctures are not as close ;is those of the 

 scutum but are separated in some places as much as those of the vertex; 

 terminal tergite with strong, median triangular-shaped tooth which is 

 longitudinally carinate, the lateral angles of the tergite broadly rounded; 

 in appearance at first sight the segment seems to have a single median 

 tooth but in reality it is tridentate, the lateral teeth being very short and 

 obtuse; second recurrent distinctly beyond the second intercubitus, the first 

 abscissa of the radius one-fifth shorter than the second, the second abscissa 

 of the cubitus but little shorter than the first. Black; clypeus except 

 apical margin, mandibles except margins, inner orbits to the top of the 

 eye (broader below the antennae), a spot on the superior posterior orbits, 

 two spots at the anterior margin of the mesoscutum, tubercles, a dot on 

 the tegulae anteriorly, lateral margin of the scutellum and a band on the 

 first five tergites which is emarginate medially and submarginate on each 

 side, after the manner of texanum, yellnirixli irhile; tegulae and legs, except 

 the coxae, trochanters and bases of femora, rufo-ferruginous; anterior 

 femora and tibiae beneath and a spot on the apical ventral part of the 

 posterior femora yellowish-white; the usual pubescence, dense and silvery 

 white; winj s strongly smoky, venation black. 



Bear Canon. Catalina Mountains, Arizona. Described from 

 one male recorded under Bureau of Entomology No. Hopk. 

 U. S. 12082/ which refers to a note stating that this was reared 

 from a nest on the twigs of Quercus emoryi, collected by 

 Chrisman. 



Type. Cut. No. 20297, U. S. N. M. 



NOTES ON DIANTHIDIUM ARIZONIGUM ROHWKR. 



BY \Yn.u\M MIDDLETOX, Scientific Axxixldiil. /'/<. *t 



Bin-fun ni l''.ii!,ni/inli><!ii . 



In August 1914 Mr. Morris Chrismun sent to the Eastern 

 Field Slut ion \\ i! h a lot of cynipid galls, the nest of a Dianfliidiiun. 

 This nest was collected on the twig of a narrow leafed oak at 

 Bear Canon, Catalina Mts., Ari/ona. In as much as the maker 

 of this nest proved to he a new species which has been described 



