Dipter'a-: Nemücera vera, N.anomalaand.Eremochaeia. 429 



II. Nemocera anomala. 



Diptera with homologous joints of the flagellum, usually four- 

 jointed palpi, and besides with the following other characters, which 

 exclude them from aniong the Nemocera vera: 



Frequent occurrence of holoptic heads in the male sex (Bibio- 

 nidae, Siynididae, Rhy pTiidae) , or in both sexes {Blepharoceridae 

 ex parte, Orphnephilidae). 



Three distinct pulvilli (Bibionidae, Section I), or an enlarged; 

 broad, pulvilliform empodium (Bibionidae, Section II, and Rhyphus). 

 In the three other farailies the empodia or pulvilli are rudimentary 

 (Simididae, Blepharoceridae, Orphnephilidae). 



Absence of sensitive hairs (in the shape of verticils) overtop- 

 ping the usual hairy covering of the antennae. 



Three large ocelli (Bibionidae, Blepharoceridae, Rhyphidae; 

 no ocelli in Shmdiuin and Orphnephila) . 



Anomalous larvae. 



Bibionidae. Rhyphidae. 



Simididae. Orphnephilidae. 



Blepharoceridae. 



B. Palpi one or two-jointed, porrect, not pendulous, the second 

 Joint more or less clavate, larger than the first, which appears like 

 a handle of the second; the joints of the antennal flagellum (with 

 rare exceptions) not homologous (comparc the explanation on p. 422, 

 footnote 2). 



III. Eremochaeta. 



No macrochaetae; three well-developed pulvilli; heads in the 

 male, predominantly holoptic and eyes very often bisected, with larger 

 facels above than below; the eyes in both sexes often variegated iri 

 different colors; the structure of the antennal flagellum polymorphous, 

 more inconstant here than in any other group of diptera; tegulae 

 undoveloped in the Leptidae and Acanthomeridae, very small in the 

 Stratiomyidae, and in füll development only in the Tabanidae. Axillary 

 excision, alnla and antitegula, in most cases, distinctly developed. Discal 

 cell, as a rule, present; five posterior cells, sometimes four, through the 

 partial or total obliteration of a vein. Legs rather smooth. Larvae 

 with elongate heads, composed of horny plates; mandjbles not opposed 

 to each other, but moving with a more or less vertical mobility, and 

 thus foreshadowing the hook-shaped mandibles of the larvae of the 

 Cyelorrhapha (Long-headed larvae, Langköpfe of Mar no). 



Siratiomyidae. Acanthomeridae. 



Tabanidae. Leptidae (plus Xylophagidae), • 



