May— July 1S89.] 



PSYCHE. 



209 



Schrank to a very different species of 

 Aphis inhabiting Europe," and suggests 

 that the American species "might be 

 called Aphis salicicola''' 



The insect was again briefly discussed 

 as Lach)i7is salicicola by Dr. Cyrus 

 Thomas in 187S.* and finally in his 

 Synopsis of the aphididae of Minne- 

 sota,! Professor O. W. Oestland refers 

 the species to Melaiioxanthtis and 

 restores the name originally given by 

 Harris, w^hich, he says, '*is not occu- 

 pied when applied to this genus." 



The only forms of the species as yet 

 described are the viviparous ones. 



My obsei-\-ations upon the insect 

 began in October, 18SS, when I found 

 it very abundant on the twigs of a 

 species of willow {Sali.x) growing in 

 the bottoms of the Olentangy river on 

 the Ohio State University farm. The 

 sexed forms were present in great 

 abundance and could be seen mating, 

 while many of the females were busily 

 engaged in oviposition. The following 

 descriptions were drawn up from living 

 specimens. 



Wing'ed tnale. 

 Length, tip anterior to tip of folded 



wings 7-50 mm. 



Length of body . . . 2.50 mm. 

 Wing expanse .... 9.00 mm. 



Body small ; bluish black, with glau- 

 cous bloom. Legs very long, hairy; 

 coxae unicolorous with body ; femora 

 and proximas \ — % of tibia reddish 

 brown ; apical portion of tibiae together 



*8M rept. state ent. 111., p. 115-116. 



t Geol. and nat. hist surv. of Minn., Bull. No. 4, 

 p. 36. 



with tarsi, black. Antennae long,, 

 hairy, black throughout ; joints I and II 

 short, subequal ; III, long, \ longer 

 than IV, which is also about \ longer 

 than V ; VII slightly longer than VI ;. 

 joints III to VII roughened with numer- 

 ous sensoria ; cornicles vasiforni. Pro- 

 thorax with a bkmt tubercle on each 

 side. Wings hyaline ; veins brown- 

 ish ; wing insertioiis generally greenish 

 black. 



Described from numerous specimens 

 taken on twigs Salix sp., 29 October 

 1S8S. Some of them seen in copula 

 with ovi^oarous females. 



Oviparo2is female. 



Length of body • • • . 3.00 mm. 

 Width of bodv across abdo- 

 men 1.50 mm. 



Body bluish black, with a glaucous, 

 bloom. Legs hairy ; coxae unicolorous 

 with body ; femora and proxima i-| 

 tibiae yellowish brown, and apical por- 

 tion of tibiae together with tarsi black. 

 Antennae hairy ; joints I and II uni- 

 colorous with body, proxima \-\ of III 

 yellowish brown, and the remainder 

 black : joints I and II short, subequal ; 

 III longest of any but shorter than IV 

 -f V ; IV slightly longer than V ; VI 

 and VII subequal: V, VI, and VII 

 roughened with numerous sensoria.. 

 Prothorax with a blunt tubercle on' 

 each side. Cornicles short, vasiform, 

 flanged at tip ; orange yellow. Rostrum 

 blackish, reaching anterior margin pos- 

 terior coxae. 



Described from many specimens col- 

 kcted on twigs of Salix sp., 29 Octo- 

 ber 1888. 



