lurord.s of Bies. 'M)l 



from al)i)vo, white, occupying ai)()ut two tliirds of the 

 (lisfancc between eye and antenna, separated from eye only 

 by a narrow sliiniiif^ band or line, and endini; at about, the 

 level of the antennae : mesothorax with very Vav^c and deep, 

 widely se|)arated pnnetures ; area of metathorax with large 

 coarse rngic; abdomen shining, M'ith small but distinet 

 l)uiu'tures, the bands represented only by jjatches of white 

 luiir at sides of segments 2 to 4 ; second segment in middle 

 dejjressed more than one half, but not as much as two 

 thirds. 



The sculpture of the head and thorax practically agree 

 with those of A. Marue, Kob., but, apart from the colour 

 of the abdomen, legs, and caudal fimbria, perforatella is a 

 smaller insect. The sculpture of the area is much coarser 

 than in A. splfcodina. 



Hub. Boulder, Colorado, June 11, 1905 {W, P. Cockerell). 



The following table separates this species from its nearest 

 allies : — 



Mesolborax letweeii the piinctiues shiny ; tarsi 

 dark ; abloiniiial st'^uieuts^ and ^^ with con- 

 spicuous laU'val patchi'S ( f white hair multipUcata, Ckll. 



Mes. lUiorax hctwet'n tlie piinctin-es dullish 1. 



1. Tar.>i of middle and hind lo^'s, aud tibite of hind 



li'jrti, clear red : size smaller perfoiutella, Ckll. 



Tar.>i dark reddish or blackish : size lar^rer .... 2. 



2. Al)domen nearly always red ; stijrma red Marim^ Rob. 



Abdomen always black ; stigaia dark (imndu)r, Ckll. 



Andrena {Pterandrena) Gardiner'i, sp. u. 



? . — Length 10-11 mm. 



Black, the tliorax dull and granular, the abdomen shining 

 and punctured; pubescence greyish white, rather long and 

 dense on thorax above ; abdominal segments with the hind 

 margins hyalme, but covered by very conspicuous continuous 

 Avhite hair-bands, that on the first a little weakened in the 

 middle; a|)ieal fimbria pale yellowish. Head ordinary; 

 ]>roe(Ss of labrum strongly bidentate ; clypeus shining, with 

 strong p\inetures, distinctly separated in the michlle ; no dark 

 hairs about head; apical six joints of Hagellum red beneath; 

 foveie, seen from above, greyish white, rather narrow, not 

 occupying more than lialf of distance between eye and 

 autenme, not separated from eye, and (juite short, scarcely 

 reaching level of antenmc ; mcsotliorax (|uite dullish, with 

 small but distinct punctures ; area granular ; tcgiihe hyaline, 

 with a reddish sjxit. Wings a little dusky ; stigma small 

 and narrow, light ferruginous, margined with darker. 



