. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 52 OITR SHADE TREES AND THEIR INSECT DEFOLIATORS. iu the,early part of October a large bole ot exit in tbeir posterior and dorsal ends, from wbicb tbe icbneuinous bad escaped. Trying to obtain winged specimens ot tbis parasite one buudred and forty of tbese co- coonsâand only sucb as were not perforated iu any wayâwere collected and put in a glass jar. Only a single female was produced from all up to time of writing, wbilst very large numbers of secondary parasites issued from October 11 till tbe 20tb of November
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 52 OITR SHADE TREES AND THEIR INSECT DEFOLIATORS. iu the,early part of October a large bole ot exit in tbeir posterior and dorsal ends, from wbicb tbe icbneuinous bad escaped. Trying to obtain winged specimens ot tbis parasite one buudred and forty of tbese co- coonsâand only sucb as were not perforated iu any wayâwere collected and put in a glass jar. Only a single female was produced from all up to time of writing, wbilst very large numbers of secondary parasites issued from October 11 till tbe 20tb of November, and doubtless otbers will appear during tbe spring of 1887, because some of tbese inflated skins sbow as yet no boles of exit. 'â ^TacMna sp. (Fig. 26.)âTbe parasites of jBT. cunea described so far all belong to tbe order Hymenoptera, wbicb furuisbes tbe greatest number of tbem. But tbe fly now to be de- scribed is fully as useful as any of tbe otbers. "Tacbina flies are very easily overlooked, because tbey resemble large bouse flies, botb in appearance andiu fligbt, and tbeir i)resence out of doors is not usually noticed on tbat ^ ââ . ,â ,. u account. Yet tbey play a very important Fig. 26.âa Tacliina-fly. ^ l ^ ^ i role, living as tbey do in tbeir larval state entirely in insects. During tbe caterpillar plague sucb flies were often seen to dart repeatedly at an intended victim, buzz about it, and quickly disappear. If tbe caterpillar tbus attacked was investigated, from one to four yellowisb-wbite, ovoid, polisbed, and tougb eggs would be found, usually fastened upon its neck, or somfe spot wbere tbey could not readily be reacbed. Tbese eggs are glued so tigbtly to the skin of tbe caterpillar tbat tbey cannot easily be removed. Sometimes as many as seven eggs could be counted upon a single caterpillar, sbowing a faulty instinct of tbe fly or flies, because tbe victim is not large enougb to furnisb food for so many voracious maggots. If tbe victim bappens to be
Size: 1678px × 1490px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectentomology, booksubjectinsects, booky
