178 THE ENTOMOLOGIST. 



A NEW APHID-INFESTING APHELINUS WHICH IS 

 NOT BLACK. 



By a. a. Gieault (The University of Illinois). 



In October, 1908 (' Entomological News,' Philadelphia, xix. 

 pp. 365-367), Dr. L. 0. Howard summed up the existing know- 

 ledge of the species of the Eulophid subfamily Aphelininte 

 known to be parasitic upon aphids, and at the same time 

 described two new forms with the same habit. All of the aphid- 

 infesting Aphelininse, according to Dr. Howard, are species of 

 the genus ApheUnus, Dalman, and all are characterized by 

 having a preponderance of black in their coloration, and by 

 having hairy eyes. That is to say, all are of the general 

 appearance of the first known aphid-infesting species, the com- 

 mon Aphelinus mail (Haldeman). It is, therefore, somewhat 

 novel to find a species of this group which is an undoubted 

 aphid parasite, but which is totally yellow in colour, with prac- 

 tically hairless eyes, and which resembles very closely the 

 coccid-infesting Apheliims mytilaspidis, Le Baron. This novel 

 aphid-infesting species differs from mytilaspidis in being more 

 intensely yellow, nearly a pale green in colour, the last-named 

 species being about the shade of yellow known as gamboge ; 

 structurally, it differs markedly in the quality of the discal 

 ciliation of the fore wing proximad of the oblique hairless line, 

 namely, in having those cilia very much coarser and arranged 

 only in about four lines (a fifth line farther proximad and 

 separated from the others by a naked area), the lines separated, 

 and the cilia at least four times coarser than the dense, 

 moderately fine discal ciliation distad of the hairless line. The 

 oblique hairless line of the fore wing is decidedly broader than 

 is the case with mytilaspidis, and another difference is present in 

 the penultimate antennal joint which is shorter, only a fourth 

 of the length of the ultimate joint, or even less, and wider than 

 long. In mytilaspidis, the penultimate joint is distinctly longer 

 than wide, and nearly a half of the length of the ultimate or 

 club joint. Taking the foregoing into consideration, this new 

 species need not be confused with any other species of the genus. 



Aphelinus automatus, sp. n. (Normal position). 



Female. — Length, 0-90 mm. General colour uniformly pallid 

 green, the eyes and ocelli red, the tips of the mandibles fuscous, the 

 venation concolorous with the body and the wings wholly hyaline. 

 Immaculate. 



Structurally as in Ap)helinus mytilaspidis, Le Baron, excepting as 

 mentioned above. Proximad of the oblique hairless line of the fore 

 wing are about from three to four lines of discal cilia which are 

 coarse and at least four times larger than the normal, rather fine 

 discal ciliation of the wing distad of the hairless line. Still farther 



