HYMENOPTERA. 147 



12. LlTHURGUS GIBBOSUS, n. S. B.M. 



Female. Length 7 lines. Black, in front of the antennae 

 is a transverse curved elevation, which is concave in front, shining, 

 and sprinkled with large deep punctures ; at the base of the an- 

 tennae, down the sides of the face, and on the margin of the 

 clypeus covered with white pubescence, that on the latter has 

 some fulvous hairs intermixed. Thorax, disk much elevated and 

 coarsely rugose ; the pubescence in front and on the sides white, 

 thickest at the sides of the metathorax, that on the legs is also 

 white; the anterior and intermediate tarsi covered with long 

 pubescence, that on the former has a slight yellowish stain, that 

 on the latter pale fulvous ; posterior tarsi wanting ; wings fusco- 

 hyaline, palest at their apical margins. Abdomen much de- 

 pressed at the base, the margins of the segments laterally have 

 a narrow white fringe ; the apical segment above densely covered 

 with black pubescence, the pubescence on the abdomen beneath 

 pale yellow. 

 Hab. United States. 



13. LlTHURGUS COMPRESSUS, n. S. B.M. 



Male. Length 5-5| lines. Black, the face covered with a 

 silvery-white pubescence, on the cheeks, legs and sides of the 

 thorax it is of the same colour ; wings fusco-hyaline ; claw -joint 

 of the tarsi ferruginous, the calcaria testaceous. Abdomen much 

 flattened, the margins of the segments depressed and having a 

 fascia of white pubescence, more or less interrupted ; the apical 

 segment produced into a short point or style at the apex. 

 Hab. United States. (E. Doubleday, Esq.) 



Genus 12. CHALICODOMA. 



Apis, pt., Fabr. Ent. Syst. Supp. p. 274. 

 Xylocopa, pt., Fabr. Syst. Piez. p. 342. 

 Megachile, pt., Latr. Hist. Nat. Crust. Ins. iv. 

 Chalicodoma, St. Farg. Hym. ii. 



1. CHALICODOMA MURARIA. B.M. 



Apis muraria, Fabr. Ent. Syst. Supp. p. 274. 50. 

 Xylocopa muraria, Fabr. Syst. Piez. p. 342. 17. 

 Megachile muraria, Latr. Hist. Nat. Crust. Ins. xiv. 60. 15; 

 Gen. Crust. Ins. ii. 349. 

 Spin. Ins. Liq. i. 148. 17. 



H 2 



