. The American entomologist. Entomology. Color—Mottled with yellow and crimson. •Firstdescribeaby tile senior Editor under tlie nume'of piunm iu Proc. But. Soc. Phil. LIT p. 639, '. able for being tlie only American gall that is known to grow out ot (he acorn. It occurs in- discriminately ujioii Black and Eed Oak, I'each- ing maturity in August and September. At that period it is solid but fleshy, and when cut into is of a pink color inside shading into yellow towards the middle. Subsequently, as it dries, it becomes so hard as fo be cut with ditiiculty, IFig. si] ^ Color—IJlue
. The American entomologist. Entomology. Color—Mottled with yellow and crimson. •Firstdescribeaby tile senior Editor under tlie nume'of piunm iu Proc. But. Soc. Phil. LIT p. 639, '. able for being tlie only American gall that is known to grow out ot (he acorn. It occurs in- discriminately ujioii Black and Eed Oak, I'each- ing maturity in August and September. At that period it is solid but fleshy, and when cut into is of a pink color inside shading into yellow towards the middle. Subsequently, as it dries, it becomes so hard as fo be cut with ditiiculty, IFig. si] ^ Color—IJluek. its color inside changing, first to blood-red and afterwards to bi-owii. The insect that produces this gall (Cj/ni/JK q. prunus, new species, Fig. 81), makes its tippearance in April, and is remarkable for lying two years in the gal! before it eats its way out, remaining in the larva state for over a year: indeed some of them re- main in the larva state for over two years, aud do not eat their way out until Ihc end of the third year.* Figure 80, i/, shows tliis same gall when cut open, and figure 80, c, the central cell inhabited by the larva. •These galls were found fully matured and in large umn- bers in August and September, 1864. In lleeember, 18B4, and in April, May, June and July, 1865, the insect was still in the larva state.' In October, 1865, out of '28 galls that were cut open, 15 contained the larva, and 13 the perfect gall-fly. Of these larvte 12 were re-enclosed in their galls. In April and September, 1866, Ihcy were still in the larva state, and it was not till April li, 1867, that a single-winged fly ate its way out of a gall. On cutting into the gall Irora which it had emerged, the cell was found half full of excrement, showing thatthelarva hail " fed up " since 186.^. We annex a des;cription of the perfect fly produced from this gall,as the species is new to scienct'. CysiPS Q. PRUNUS, 11. sp. 5 Black. Head rather coarsely rugoso-pmictate;
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectentomology, bookyear1
