232 Mr. T. D. A. GockereW— Descriptions and 



Switzerland or the Tyrol, among cherry-trees, vines, and fig^ 

 trees. The occurrence is very remarkable, since the other 

 species of Exoneiira are Ansti-alian. 



Compared with the Australian E. bicolor, the Syrian insect 

 differs not only in colour, but very conspicuously in the 

 elongated face, with projecting elypeus and large malar space ; 

 also in the shape of the abdomen and the venation. Com- 

 pared with E. bicolor, E. libanensis has the stigma smaller, 

 the marginal cell narrower, the second s.m. smaller, and the 

 lower section of b. n. much more oblique. 



In general^ E, libanensis is very like the Australian Allo- 

 dape simillhna, Smith, or the African A. nigricollis, Vachal ; 

 but both of these have the lower section of b. n. much more 

 nearly vertical. E. libanensis has a shallow basin-like 

 depression at the base of the metathorax, and the same is 

 well indicated in AUodape simillima. There is no doubt that 

 E. libanensis is an offshoot from AUodape, but it probably 

 arose by a parallel variation, quite independently of the 

 Australian forms. The South-African AUodape rnfogastra, 

 Lep. (the type of the genus), has the lower section of b. n. 

 oblique as in Exoneura libanensis. This is not the case, 

 however, in A. variegata, Smith, another species with red 

 abdomen. 



In view of the differences noted, Exoneura libanensis may 

 be taken as the type of a subgenus (? genus) Exoxeuridia. 



Lithurgus collar is. Smith. 



This Japanese species was described from the male. A 

 female from Formosa, 14^ mm. long, agrees with Smith's 

 description, except for. the usual sexual characters, including 

 the roughened mesothorax. The elypeus is longitudinally 

 keeled, and the hair along its lower margin, as well as that 

 on lower part of cheeks and front of anterior coxie, is ferru- 

 ginous. The Polynesian L. albofirnbriatus, Sichel, has a tuft 

 of black hair just behind the wings, but is otherwise practi- 

 cally the same. The Formosan L. coUaris was taken by 

 Sauter at Pilam, 1908, and is in the Berlin Museum. 



Andrena albiJiirta (Ashmead). 



Mr. S. A. Rohwer took both sexes in numbers at flowers 

 of &alix brachycarpa, at Florissant, Colorado, June 1 and 2, 

 1907. The male has no tooth on the mandibles below and 

 is not the same as A.perarmata, Ckll., which Viereck ia 1904 

 considered synonymous. True male A. perarmata, with 

 has been taken by Mrs. Bennett at 



