101 



Vertex broad, not prominent anteriorly; no capitate hairs on the head. 

 Antennae attaining to about the middle of the cornicles ; (2-tubercles) 4, 

 2i, 16, 16, Hi, 6, 26, tubercles far apart; frons convex, not sulcata. Ros- 

 trum reaching to hind coxae. Style longer than hind tarsi, hairy. Cor- 

 nicles longer than the 4th segment of the antennae, slightly tapering, 

 mouth oblique, more than twice as long as style. 



Length of body l|-lf mill., expanse of flight organs about 5^-5^ mill. 



The above description is taken from living winged females; 

 the apterous adult is similar, the form being that of M. cerasi; 

 I have not seen males. I cannot identify this species with any- 

 described Myzus, and it cannot be the "Orange Aphis" of North 

 America, as that is described as a Macrosiphum {citrijolii), dark 

 green, with garnet-red eyes. The young of Myzus citricidus are 

 brown, while those of Macrosiphum citrijolii are said to be light 

 yellowish-green or rusty-green. 



Myzus citricidus is probably an introduction from China, 

 and is very common on Citrus all over the Hawaiian Islands. It 

 is not parasitized here, so far as I know, and immediately the 

 young Orange shoots appear, they are covered by this pest. 

 It is, however, preyed on by a number of insects, which very soon 

 make a clean sweep of it; these are as follows: 



Neuroptera: Chrysopa microphya and Anomalochrysa biseriata. 



Diptera: Xantho gramma grandicornis . 



Coleoptera: Coccinella repanda and conjormis; Cryptolaemus 

 montrouzieri; Platyomus lividigaster ; Scymnus notescens; Coelo- 

 phora pupillata and Rhyzobitis ventralis. 



Hemiptera: Zelus peregrinus , but not often. 



Mr. Terry tells me these Aphids have a decided Citrus taste. 



Myzocallis Passerini. 



1860 GH Afidi ; Schouteden 1906 Mem. S. E. Belg. XII. 211. 

 kahawaluokalani sp. nov. 

 Winged Female: 



Pale yellowish, marked with pale brownish fuscous, principall)'' as 

 follows : head dorsally with a mediolongitundinal line and a speck on each 

 side of this, and lateral margins broadly, posterior margin narrowlj^; ir- 

 regular, broad submedian bands down the pronotum, lateral margins nar- 

 rowly; a suboval, interiorly pale, sublateral spot on mesonotum, a goblet- 

 shaped mark in the middle (the bowl anteriorly, the stem posteriorly), 

 posterior margin broadly; a large irregular transverse spot near the base 

 of abdomen; antennae whitish, first two segments and apices of 3rd-5th 

 pale brownish fuscous. Eyes bright pale vermeil. Abdom.en dorsally 



