No. 9. — A Collection of Sphecidae from Argentine, 

 By H. T. Fernald. 



The Sphecidae here reported upon form a part of a general collection 

 of several orders of insects made by Prof. W. M. Davis of Harvard 

 University during the years 1871 to 1873, while a member of the staff 

 at the Astronomical Observatory at Cordova, Argentine. Professor 

 Davis, although mueh occupied by his regular duties, was interested in 

 the fauna and flora of the region where the Observatory was located, and 

 devoted considerable time to making collections and observations on the 

 insects found there, and the specimens, together with remarkably fine 

 records of his observations, are now at the Museum of Comparative 

 Zoology. 



The Sphecidae in the collection are represented by seventy-seven 

 specimens, and include several forms apparently hitherto unknown to 

 science. An opportunity to study these specimens has been obtained 

 through the kindness of the Museum authorities. To Professor Davis I 

 am greatly indebted for assistance received during the preparation of 

 this paper. 



Pelopaeus figulus Dahlb. 

 Two female, ten male specimens. Length, 15-22 mm. 



Chlorion (Chlorion) cyaniventris (Guer.). 



Seven female, five male specimens. Length, 16-24 mm. 



Chlorion (Chlorion) hemiprasinum (Sichel). 



One female, four male specimens. Length, 19-25 mm. 



These specimens differ somewhat as regards color distribution from any or the 

 varieties mentioned by Kohl. The head, thorax, median segment, petiole, coxae, 

 trochanters, and more or less of the femora are blue with a greenish reflection, so 

 strong in some places that the color there might be stated as green with a bluish 

 reflection. The antennae are black except near their tips, the last three or four 

 segments being partly red. The entire abdomen beyond the petiole, the outer 



