The house-fly, Musca domestica Linn: its structure, habits, development, relation to disease and control . The surface oi the cephalothorax andabdominal segments is very finely shagreened, the latter granuloseon the sides. The hairs on this part as well as on the palpi andabdomen are simple, but obtuse. The palpi are rather sharp andstrong. The axillary joint is considerably and somewhat sub-conically protuberant above as well as protuberant near its baseunderneath. The humeral joint at its widest part, behind, is 152 ARACHNIDS AND MYRIAPODS considerably less broad than long; the cubital joint
The house-fly, Musca domestica Linn: its structure, habits, development, relation to disease and control . The surface oi the cephalothorax andabdominal segments is very finely shagreened, the latter granuloseon the sides. The hairs on this part as well as on the palpi andabdomen are simple, but obtuse. The palpi are rather sharp andstrong. The axillary joint is considerably and somewhat sub-conically protuberant above as well as protuberant near its baseunderneath. The humeral joint at its widest part, behind, is 152 ARACHNIDS AND MYRIAPODS considerably less broad than long; the cubital joint is very tumidon its inner side; the bulb of the pincers is distinctly longer, tothe base of the first claw, than its Avidth behind; and the clawsare slightly curved and equal to the bulb in length. They appear to be comuioner in some years than in (1909) says: The ordinary habitat of CJi. nodosus, asMr Wallis Kew has pointed out to me, appears to be among refuse,that is, accumulations of decaying vegetation, manure heaps,frames and hot-beds in gardens. He refers t(j its occurrence in a. Fig. 69. Clientea )iodosus, Schr. x 30. manure-heap in the open air at Lille, and draws my attention toits abundance in a melon-frame near Hastings in 1898, where itwas found by Mr W. R. Butterfield. In view of these facts it isnot difficult to understand its frequent occurrence on the legs offlies, which may have been on the rubbish heaps either for thepurpose of laying oggs, or, what is more likely, because they haverecently emerged from pupae in those places and in crawling about,during the process of drying their wings, etc., their legs wereseized by the C. nodosus. ClIEliXES XODOSUS 153 The inter-relation t the Chernes and M. doiiiestico, h(nvever,is one of no little complexity; much has been written and manydiverse views are hcM concerning it. An interesting historicalaccount nf the occurrence of these Arachnids (ni various insectshas been given by Kew (1901). Three views a
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