DURHAM DIPTERA. 8 1 



XIII. 



7 (6). Species not yellow and black. Fork of V.4.a. with a 



handle always more than one-fifth of the length of 

 the fork (IV. 26). Tipula (135) 



8 (3). Antennae combed in the male, the joints with side 



processes. 



9 (10). Male antennae combed on the inner side only. 



136. Dictenidia, Brul. (838. bimaculata, L.) 



10 (9). Male antennae combed on both sides. 



11 (12). Male antennae combed beneath as well as at the two 



sides. Xiphura, Brul. (137) 



12 (11). Male antennae not combed beneath, but only at the 



two sides. Ctenophora (138) 



Note. — In some of the Tipulidae V.4. branches before 

 reaching O. Thus V.4.1.b. does not touch O. at all, and the 

 other branch divides at O., its upper branch again dividing 

 beyond O. So that the four branches from V.4. at the 

 margin would read 4.a.a.a., 4.a.a.b., 4.a.b. (or 4.a.a., 

 4.a.b.a., 4.a.b.b.), and 4.b.. But it is better to keep to 

 the usual formulae and call them 4.a.a., 4.a.b., 4.b.a., 4.b.b. 

 (IV. 23 and 24), as this only occurs in a few small genera. 



TABLES OF SPECIES. 



134. Pachyrrhina, Mcq. 



Larvae in rotting wood and under decaying leaves. 



1 (4). Abdomen black with entire yellow bands. 



2 (8). Thorax almost black with orange spots, abdomen 



with four bands. 



790. Pachyrrhina crocata, L. 

 Bedburn, 2 $, 7-7-02. 



3 (2). Thorax yellow with three black streaks, abdomen 



with more than five bands. (791. imperials, Mg.) 



4 (1). Abdomen yellow, usually with a dark central line, 



often interrupted. 



5 (20). Abdomen with a central line. 



6 (11). Stigma faint, brownish yellow, or pale brown. 



7 (8). Side stripes on the dorsum straight at their front 



ends. (792. scurra, Mg.) 



F 



