1922] 



Graham: Wing Venation of Col copter a 



195 



with Ri. R3 turns backward and fuses with R4. In the 

 majority of Coleopterous wings R3 and R4 form a cross vein 

 between R2 and R5, but the various stages leading up to this 

 condition are found in species of several families, for example, 

 Cerambycidse, Chrysomelidae, Bostrychid^e, Spondylidas, etc. 

 (See Fig. 3). In every wing examined, the radial sector is 

 broken at the base and in many cases the basal part is entirely 

 gone. 



BUPPCSTIDAE 



BUPRC3T1DAC 



BUPRESTJDAE 



BUPRCSTIDAE 



IT TENEBmOhllDAE 



]Zr TENEBRlONIDAE 



YE ELATE BID A£ 



mr DEf/MESTWAE 



IZ HVPOTHETICAL TYPE 



Fig. 2. 



I. Buprestis fasciataFah. 



II. Dicerca tenebrosa Kby. 



III. Dicerca divaricata Say. 



IV. Choleophora liberta Germ. 



V. Upis ceramhycoides Linn. 



VI. Nyctohales pennsylvajiicus De G. 

 VII. Elateridae 

 VIII. Dermestes lardarius Linn. 

 IX. Hypothetical Coleopterous 

 Type. 



Media is typically four branched, but in the Coleoptera 

 Ml and M2 are always coalesced so that they appear as a 

 single vein. The first fork of M is near the base. Usually 

 the basal part of branch M3 and M4 is lost up to the medial 

 cross vein so that the cross vein appears to be the base of that 

 branch. The lost basal part is, however, often indicated by a 

 spur or in a few cases may be present as in Buprestis fasciata. 

 (Fig. 2-1). 



Cubitus is always two branched, but these may be fused at 

 the tip. Three anals are typically present and the 3 A is 



