HYMENOPTERA. 131 



This insect would be taken for a species of the genus Andrena 

 without attentive examination, so closely does it resemble the 

 insects belonging to that genus, but it" is easily distinguished 

 from them. 



Genus 6. SYSTROPHA. 

 (Details, Plate V.) 



Eucera, pt., Scop. Ann. Hist. Nat. iv. 9 (17/0). 

 Apis, pt., Rossi, Faun. Etrus. ii. 106. 921 (1790). 

 Andrena, pt., Ent. Syst. ii. 308. 3 (1793). 

 Hylaeus, pt., Fabr. Syst. Piez. p. 320. 6 (1804). 

 Ceratina, pt., Jurine, Hym. p. 234 (1807). 



1. SYSTROPHA CURVICORNIS. B.M- 



Eucera curvicornis, Scop. Ann, Hist. Nat. iv. 9. 

 Apis curvicornis, Rossi, Faun. Etrus. ii. 10(). 921. 

 Andrena spiralis, Fabr. Ent. Syst. ii. 308. 3. 



Coqueb. Illustr. Icon. t. 15. f. 8. 



Panz. Faun. Germ. 35. 22. 



Oliv. Ency. Meth. iv. 135. 3. 

 Hylaeus spiralis, Fabr. Syst. Piez. 320. 6 ; iv. 135. 

 Systropha spiralis, Illia. Mag. vi. 



Latr. Gen. Crust. Ins. p. 157. 



St. Farg. Hym. ii. 144. 1. 

 Hab. France; Italy; Switzerland; Spain. 



Genus 7. PTILOTHRIX. 



Ptilothrix, F. Smith's MSS. (Details, Plate VI.) 



Head not quite as wide as the thorax, ocelli placed in a slight 

 curve on the vertex ; the labium twice the length of the mentum, 

 broadest about the middle, tapering towards the apex, which is 

 blunt ; the paraglossae half the length of the labium, attenuating 

 to a point at their apex ; the labial palpi rather shorter than the 

 labium, four-jointed, the first and second elongate, placed end 

 to end, the two apical joints minute, placed at the side of the 

 second joint at its apex; the maxillary palpi six-jointed, the 

 three basal joints of equal length, the three apical ones of equal 

 length, but shorter than the basal joints ; the anterior wing 

 having one marginal and three submarginal cells, the marginal 

 cell slightly rounded at its apex ; the second submarginal cell 



