DUEHAM DIPTEEA. 21 



(D.) (5) Bristles. — The abdominal bristles are distinguished 

 by the numbers of the segments, and by whether 

 they are placed on the /ore or hind margin, or on 

 the disc (that is, between the fore and hind 

 margins), or on the centre, or on the side of the 

 segment; thus, in the diagram Plate VI. 41 — 

 1-1 are the side fore marginal bristles ; 2-2, the 

 side hind marginal; 3, the central fore marginal) 

 4, the central hind marginal; 5, the discal. 



E. BRISTLES AND HAIRS.— Very short and fine hairs, 



sometimes somewhat scale-like, are called tomentum or 

 pubescence; stronger and longer — hairs; still stronger — 

 bristles, or setce, or spines ; or a very thick one — a thorn, a 

 spur, or a calcar. 



F. MARKS. — When a long marking lies parallel, or nearly 



so, to the major axis of the body, leg, or wing, i.e., from 

 head to tip of abdomen, or from base to tip of leg or 

 wing, it is called a stripe ; when it lies at, or nearly at right 

 angle to this, it is called a band. 



t 



TABLE OF VEIN AND CELL NAMES. 



The following table may be useful in consulting works on 

 Diptera, and shows the confusion of the wing terminology. 



LONGITUDINAL VEINS. 



Name used Various Synonyms. 



in this List. 



V.C. Costa, costal vein, Vorderrandader, or Randader. 

 V.I .a. Mediastinal vein, Vorderast der ersten Langsader, 



zweite Langsader, or Hiilfsader. 

 V.l.b. Subcostal, submarginal, erste Langs-, dritte Langs-, 



Unterrand-Ader. 

 V.2. Radial, or zweite Langsader. 

 V.2.a. Upper branch of the radial vein, obere Gabel der 



zweiten Langsader, or fiinfte Spitzenader. 

 V.2.b. Lower branch of the radial vein, untere Gabel der 



zweiten Langsader, or vierte Spitzenader. 



