NORTH AMERICAN SWAMMERDAMIA — DUCKWORTH 551 



Stvammerdamia pyrella (De Villers) 



Figures 2a,b,e, 3a 



Tinea pyrella De Villers, 1789, Caroli Linnaei entomologia faunae Suecicae . . . , 



vol. 2, p. 515. 

 Tinea cerasiella Hiibner, 1810-13, Sammlung europaischer Schmetterliuge, vol. 8, 



Tiu. taf. 48, fig. 332. 

 Oecophora passerella Zetterstedt, 1840, Insecta Lapponica, p. 1009. 

 Swammerdamia variegata Teugstrom, 1869, Notis. Sallsk. Fauna Flora Fennica 



Forh., vol. 10, p. 364. 

 Swammerdamia nanivora Stainton, 1871, Entomologist's Annual, 1871, p. 96. 



Alar expanse 9-12 mm. 



Antenna whitish basally, fuscous beyond. Head white; labial palpus 

 gray, tip of apical segment whitish. Legs gray. Thorax dark gray 

 dorsally. Forewing gra}^ overcast to a greater or lesser degree with 

 fuscous scales; a white anteapical costal spot; ciUa fuscous with a 

 coppery lustre. Hindwing gray, cilia gray. 



Male genitaha: See figures (slide WDD 3195). Harpe broad with 

 one or more large, heavily sclerotized, long setae on sacculus, ventral 

 edge of sacculus with several short, heavy setae usually grouped in 

 pairs; ventral plate of the gnathos with numerous small nodules; 

 aedeagus short, straight, pointed at apex; vesica armed with cornuti. 



Female genitalia: See figures (sUde WDD 3196). Ductus bursae 

 with granular sclerotizations on posterior half, shorter than length of 

 abdomen; corpus bursae with signum a sclerotized, dentate plate. 



Type: Lost. 



Type locaUty: Southern France. 



Food plant: Friese (1960) reports the larvae from Pyrus communis 

 L., Malus silvestris Mill. {—Pyrus malus L.), Prunus cerasus L., 

 Prunus domestica L., Crataegus spp., and in northern Europe on 

 Betula nana L. 



Distribution: bkitish Columbia: Fraser Mills (July, Aug.). Wash- 

 ington: BelUngham (Aug.). 



The first authentic record of this species in North America was 

 pubHshed by Clarke in 1942, as was mentioned earlier. It is undoubt- 

 ably an introduction from Europe, most likely brought in with plant 

 material imported for the vast orchards of the Pacific Northwest. 

 A very common and widespread species in Europe, S. pyrella does 

 not seem to have estabHshed itself as well in North America; however, 

 due to its small size and dull color, it may well be that it has been 

 overlooked by most collectors. 



Although rather indistinct in coloration, S. pyrella is readily rec- 

 ognizable by characters of the genitalia. These characters have been 

 noted in the key, and examination of the figures readily illustrates 

 them. 



