568 



AUTHENTIC HISTORY 



ORDER DIPTERA. 



The name of this order was first used by Aristotle, and is a compound of two Greek 

 words signifying twice or hco, and icings; that is, "Two-winged insects," although 

 there are a few species belonging to it that are entirely wingless. The insects included 

 in it are commonly called Crane-flies, jMosquitos, Gnats, Bot-flies, Horse-flies, Ox-flies, 

 Blow-flies, House-flies, &c., &c. They are characterized by having a single pair of 

 wings, which are membranous and usually extended, and affixed to the middle of the 

 sides of the thorax. Near the insertion of the wings are a pair of small appendages 

 called halterers. The mouth is provided with a hmistellum composed of from two to six 

 scaly lancet-like pieces, inclosed in a groove or canal upon the upper surface of a fleshy 

 snout' or proboscis; or covered by one or more inarticulated plates, forming a sort of 

 sheath. The antennoi exhibit various degrees of development, from very short to very 

 long. The ocelli, when present, are three in number, and the eyes are large, lateral, 

 and composite — those of the males in many instances being much larger than those o f 

 the females. The abdomen is usually attached to tlie thorax by only a portion of its 

 basal dimeter, and is generally more pointed in the females than the males. The tarsi 

 are flve-jointed and terminated by a small pair of hooks, and often by a sort of cussion- 

 like process, which enables the insect to walk on a very smooth surface, or with the ba'^ 

 downward. The larvae are usually called "maggots," and there is less diversity in their 

 transformations than there is in some other orders, or than the diversities in the mature 

 insects would seem to imply, Lancaster county, occupying a geographical position 

 intermediately between North and South, has many species within her borders that are 

 common to either of those portions of our territory, but the local Diptera of the county 

 is only very partially developed in history and classification. 



CULICID^. 



CuLEX Linn. 



damnosus Say. 



pipiens Linn, 



cingulatus Fab. 



ciliatus Fab. 



pangeus Weid. 



colon liar. 

 Anopheles Mei. 



granulatus liar. 



quadrimaculatus bay. 



TiPULID.E. 



TiruLA Linn. 



alternata Say. 



trivittata Say. 



flavicans Fab. 



ferruginea Fab. 



tricolor Fab. 



nubilis liar. 

 Cecidomtia Fab. 



grossularia^ Fch. 



tritici Krb. 



robinia Hid. 



inimica Fell. 



cerealis Fch. 



graminis Fch. 



destructor Say. 



salicis Fch. 



culmicola Mor. 

 Ctexoi'iiora Mei. 



abdominalis Say. 

 MOLOBRUS Fch? 



mali Fch. 



A'ulgaris Fch. 



inconstans Fck. 



fuliginosus Fch. 

 Ptyciioptera Mei. 



clavipes Linn. 

 LiMNOBiA Mei. 



rostra ta Say, 



scutellata Say. 

 Ryphus Lat, 



alternatus Say. 



discoidus Say. 

 CiiiRONOMrs Mei, 



albitarsis Har. 



claracoUis Har, 



lateralis Har. 



biplagiatus liar, 

 SiMULiUii Lai. 



obscurum liar. 



calceatum Har. 



