HEMIPTERA 1 1 3 



Tribe DIMERA. 



Fam. PSYLLIUAE. 



No previous records of Hawaiian Psyllids have been made, to my knowledge, and 

 only 18 individuals, all belonging to the sub-family Triozinae, have been collected by 

 Mr Perkins. Eleven specimens are referable to (probably) two species forming a new 

 genus, while the others belong to the widely distributed and specifically numerous 

 genus Trioza Frirst. I)r L. O. Howard informs me that there is a good collection, as 

 3'et unworked, in the U. S. National Museum. 



Hevaiieva, gen. nov. 



Distinguished by the elongate, sub-parallel tegmina and their distinctly rounded 

 apical margin ; costa scarcely arched : the entire absence of a short veinlet, or of a 

 marginal granule, in any of the posterior cells. Upper side of head and thorax glabrous, 

 except for sparse bristly hairs. Cones not very prominent. Stigma present. 



Head (with eyes) as wide as mesonotum, a little wider than pronotum. Eyes 

 prominent. Vertex anteriorly strongly carinate transversely. Stigma somewhat 

 obscure, seeming at first to be only a thickening of the costa. 



( I ) Hcvahcva pcrkinsi, sp. nov. 



PI. lY. fig. 1. 



Head, thora.x, abdomen and tegminal nervures bright ochraceous, jialer beneath. 

 Eyes blackish, ocelli rubid. Antennae (pallid) and tarsi fumate. Hairs pale ochraceous. 

 Tegmina hyaline, immaculate. Nervures slightly hairy. Pronotum slightl)- longer 

 medianly than the head (seen from above), a little shorter than the mesonotum. 

 Width of vertex between eyes subequal to the eyes together. Tegmina 2^ times as 

 long as broad, radius slightly sinuate. 



Long. Corp. o'93 mm., lat. o"5i mm., exp. tegm. 3I mm. 



Hab. [a) .^ Oahu (August), Perkins: {i>) Konahuanua ridge (March). 



I have definitely determined 3 examples [a), while 7 others [6) almost certainl\- 

 belong to this. There is a single male, much larger, greenish in colour and with head 

 structure etc. different, but as it is gummed down on its dorsum on to card, I have 

 left it undetermined. 



TkKizA Ftirster. 

 Trioza Forster, 1848, V'erh. Yer. Rheinl. v. p. 67. 



