184 INSECTS AFFECTING THE ORANGE. 



and issue from the puparium, in numbers varying from six to eighteen, 

 through a number of small holes which they gnaw in its top and sides. 

 They are from l mm to 2 mm in length, and have the dark bronze and 

 metallic colors with hyaline and iridescent wings so common in this 

 family (Chalcididce). 



THE DUSKY- WINGED APHIS-FLY. 



(Baccha lugens Loew.) 

 [Fig. 84.] 



Another species of Baccha, scarcely less common than the preceding, 

 has a more leech-like larva, in form flattened and dilated behind, but 

 with the anterior joints lengthened into a very mobile and extensile 

 neck. The surface of this larva is nearly smooth, without the spines or 



velvet hairs of the first species. In color 

 the larva is dark, inclining to purple when 

 not feeding, with cream-colored blotches, 

 tinged with pink. The length in repose 

 is about 8 mm (fe inch). 



The puparium (Fig. 84) is dull brown, 



FIG. 84 Baccha lugens, puparium. gourd-shaped ; the anterior portion greatly 



inflated and behind suddenly flattened and 



contracted to form a sort of handle. The terminal spiracles of the larva 

 are seen at the tip of the handle-like abdomen, where they form a pair 

 of wart-like prominences. 



The fly does not differ greatly in form from the preceding; it has eyes 

 of brighter red, and the wings are distinctly clouded with spots of brown ; 

 the thorax less shining, dark bronze; the shield (metathorax) dark 

 bronze, like the thorax; abdomen thicker, less broadly dilated at the 

 end, uniform brown in color. The size of the imago varies greatly, from 

 8 mm (-*<& inch) (small males) to 12 mra (& inch) (large females). 

 The egg is indistinguishable from that of Baccha babista. 



THE RUDDY APHIS-FLY. 



(Baccha cognata Loew). 



A third species of this genus is found in company with the preced- 

 ing species preying upon Aphis, sometimes upon Orange, but more fre- 

 quently upon different kinds of Plant : lice found on herbaceous plants 

 and weeds of the garden. In this species the form of the fly and its 

 larva approach closely to that of B. lugens, but they are somewhat more 

 slender and smaller than either of the preceding species. In the per- 

 fect fly the color of the eyes is mahogany-brown ; the thorax black, not 

 shining; the wings densely clouded with red- brown; the abdomen dull 

 red, and very slightly dilated at the tip. 



