1920.] . 39 



however, until 1839, wlien Haliday gave a short Latin tliugnosis (Ann. 

 & Mag. Nat. Hist, ii, p. 189) of the genus and the species. In 1848, 

 Walker redescribed both serrulatus and hirtellus under the comprehen- 

 sive genus Apliis. In 1860, Passerini (Gli Afidi, p. 28) founded the 

 genus Sipha with Aphis glyceriae Kalt. as the type. Walker seems to 

 have considered Atheroides and Sipha to be closely allied, for in the 

 "Zoologist," xxviii, 1870, p. 2000, we find him remarking of Aphis 

 glyceriae Kalt., " type of the genus Sipha, hitherto included in the 

 genus Atheroides Haliday." Since that date nothing further has been 

 written concerning Haliday's genus, though there is in the Buckton 

 collection one slide labelled in Buckton's handwriting " Atheroides 

 serrulatus.''^ The species is correctly determined, but Buckton never 

 published any description of the insect. 



The genera Atheroides and Sipha bear considerable superficial 

 resemblance. In both tlie antennae are very similar, both have 3 seg- 

 ments to the rostrum, both have the 3 thoracic segments, and the 

 1st abdominal segment distinct; but in Sipha the cornicles are dis- 

 tinctly tuberculiform, while in Atheroides t\\ey are mere pores, flush 

 with the dorsum. In Sipha the cauda is distinct, and knobbed, a cha- 

 racter which brings it into the Chaetophorini, whereas Atheroides has 

 no Cauda and is quite evidently allied to the Lachnini both by tlie 

 position and shape of the genital and anal plates. The fore wing of 

 the alate female of Sipha has the cubitus twice forked, but as far as can 

 be made out in the single alate 2 of Atheroides hirtellus before 

 me, the cubitus would appear to be hut once forked. The wing is, 

 however, in rather poor condition. The hind wing in both has 2 oblique 

 veins. 



The genus Atheroides Halida}'^ ma}^ be defined as follows : — 



Apterous $ linear, flattish, spiny ; antennae 5-segmented, very short, 

 reaching to the prothorax ; segments I, II, IV very short, subequal, III and 

 V longer, V with spur equal to or a very little longer than its base. Proboscis 

 3-segmented, reaching to the 2nd pair of coxae. Thoracic and Umt ahdoniinal 

 segments distinct, apical segment distinct ; marginal scutes overlapping ventral 

 surface. Cauda absent. 



Type of genus, Atheroides serrulatus Halid. 



A. serrulatus Halid. 



Atheroides serrulatus Haliday, Ann. &, Mag. Nat. Hist, ii, 1839, 

 p. 189. 



Aphis serrulatus (Halid.) Walker, Ann. & Mag. Nat. Hist. (2) ii, 

 1848, p. 47. 



Sipha paradoxa Theobald, Entomologist, xli, Feb. 1918, p. 20. 



