15 



16 



14. Body compact, uniformly dull greenish or yellow; 

 females without frontal callosities, otherwise head, 

 wing, and leg characters not unusual (CI1LOROTA- 

 BANINI) Chlorotabanus Lutz 



— Bodies more slender, predominantly black; subcallus, 

 antennal scape and tibiae swollen; vein R 4 curved 

 abruptly forward apically (BOLBODLMYIINI) 



Bolbodimyia Bigot 



Fore tibia swollen, more thickened than the respective 

 femur or other tibiae; wing with a fumose apical spot 

 and no spur vein on base of vein R 4 



Diachlorus Osten' Sacken 



Fore tibia normal; wing hyaline or the cross veins 



clouded, and spur present on base of R 4 16 



Body pruinose without distinct pattern (in Nearctic 

 species); female with very wide front and no ocel- 

 ligerous tubercle; male with occipital tubercle sup- 

 pressed Aegialomyia Philip 



— Body bicolored or with definite pattern; female with 

 normal front and distinct ocelligerous tubercle; male 

 with prominent tubercle in the occipital notch 



Stenotabanus Lutz 



17. Flagellum of antenna with 4 divisions; scape con- 

 siderably longer than thick; eyes in life (or relaxed) 

 and wings with irregular bands and spots (CHRYSO- 

 ZONINI) Chrysozona Meigen 



— Flagellum usually with 5 divisions (rarely fewer by 

 apical fusion and then wings hyaline); scape scarcely 

 longer than thick (fig. 14:47<i); eyes in life banded or 

 unicolorous (TABANINI) 18 



18. Plate of 3rd antennal segment with a hooklike dorso- 

 basal extension; eyes sparsely hairy 19 



— Plate rarely with dorsobasal directed tooth, and if so, 

 eyes bare 20 



19. Subcallus above antennae with erect black hairs 

 laterally Agkistrocerus Philip 



— Subcallus pollinose, no hair Hamatabanus Philip 



20. Flagellum modified with 2 to 3 terminal divisions more 

 or less fused and indistinct; small flies, 11 mm. and 

 less 21 



— - Flagellum normal, 4 distinct divisions; small to large 

 flies 22 



21. Very small flies, length less than 9.5 or rarely 10 mm.; 

 frontal callosity of female missing or rudimentary; 

 eyes ostensibly bare, unbanded in life 



Microtabanus Fairchild 



— Length 9.5 to 11 mm.; frontal callosity distinct; eyes 

 bare or very sparsely pilose, banded in life (or relaxed) 

 Glaucops Szilady 



22. Vertex of female with a distinct denuded ocelligerous 

 tubercle; of male with an elevated, anteriorly shining 

 tubercle; in doubtful cases eyes are densely pilose 



23 



— Vertex without such tubercles; if raised in male then 

 completely pollinose; eyes bare, or sparsely pilose, or 

 in certain males densely pilose 24 



23. Eyes ostensibly bare; front of female narrow, the 

 callosity long and linear; upper eye facets of male 

 strongly differentiated and enlarged; scutellum pallid 



Leucotabanus Lutz 



— Eyes usually distinctly pilose; front of female variable, 

 but the basal callosity correspondingly broad; eye 

 facets of male relatively undifferentiated; scutellum 

 usually dark Tabanus (subg. Hybomitra Enderlein) 



24. Eyes yellow or brown, distinctly pilose, particularly 

 in males; front of female without callosities, or they 

 are reduced to small isolated bare spots; a single 

 diagonal, dark band on eyes, often showing even in 

 dried specimens Atylotus Osten Sacken 



— Eyes blackish when dried (certain males only lower 

 area of small facets), bare or if sparsely hairy, with 

 more than 1 purple band in life and the abdomen may 

 have a uniform pale, middorsal stripe; front of female 

 with a broad basal callosity 25 



25. Antennae including flagellar divisions, and palpi with 

 unusually erect hairs; palpi blunt and stout, the pro- 

 boscis relatively quite small; postocular rim (between 



445 

 Wirth and Stone: Diptera 



eye margins and occipital hairs) unusually wi<i<- .... 

 Anacimas Enderlein 



— Not with this combination of characters; hairs of 

 flagellar divisions very inconspicuous 26 



26. Body and wings entirely deep brown to black (abdomen 

 may have pale lateral vestiture); frontal and facial 

 callosities unusually protuberant and shining; eyes 

 bare, in life with the upper of 4 purple bund atronglj 



decurved and widened outwardly 



Whitneyornyia Bequaert 



— Body and wings varicolored (when entirely black, more 

 than 15 mm. long); eyes bare or sparsely hairy 



Tabanus (s. str.) Linnaeus 



Larvae 



1. Body club-shaped, the thoracic segments slender, the 

 abdominal segments robust (terrestrial) 



Goniops Aldrich 



— Body tapering anteriorly and posteriorly, not club- 

 shaped 2 



2. Small, usually less than 20 mm. when mature; 2nd and 

 3rd antennal segments subequal, or the distal one the 

 longer; tracheal trunks (seen in living larvae) unswol- 

 len, sinuous; usually a protrusile stigmatal spine; 

 body almost entirely striated Chrysops Meigen 



— Large, or very large, usually more than 20 mm. when 

 mature; antenna with the terminal segment much the 

 shortest and smallest; tracheal trunks usually swollen; 

 almost never with a protrusile spine at tip of siphon; 

 ventral and dorsal areas often smooth, especially on 

 thorax 3 



3. Anal segment rounded, the siphon short, hardly exser- 

 tile; dark ornamentation confined to anal and 3 thoracic 

 segments (fig. 14:48a) Chrysozona Meigen 



— Anal segment usually tapering, the siphon more or less 

 elongate when extended; dark markings, when present, 

 usually on other abdominal segments as well, or 

 confined to a prothoracic collar only. .Tabanus Linnaeus 



Pupae 



1. One spine on each side of median line on dorsum of 

 each abdominal segment much stronger than the others 

 in the series Goniops Aldrich 



— Spines of each series either of an almost uniform 

 strength or at least no 2 spines conspicuously stronger 

 than the others 2 



2. Dorsolateral and lateral combs absent on caudal seg- 

 ment; bristles on frontal tubercles double; antenna 

 about as long as basal width, surpassing adjacent 



line of dehiscence (best seen after emergence) 



Chrysops Meigen 



— Dorsolateral or lateral combs present; frontal bristles 

 single; antenna long or short 3 



3. Antenna elongate, the tip surpassing adjacent line of 

 dehiscence Chrysozona Meigen 



— Antenna short, only about as long as basal width, the 

 tip not attaining adjacent line of dehiscence 



Tabanus Linnaeus 



The California Species of Tabanidae 7 

 Key to the California Species of Apatolestes 



1. Females; eyes not contiguous 2 



— Males; eyes contiguous 9 



2. Front basally inflated, shining black or dark brown, 

 pollinose only at the vertex around the ocelli (fig. 

 14:48e) 3 



— Front either normally pollinose, or with a bare re- 

 stricted area, not with a calluslike swelling above the 

 subcallus 5 



7 The following keys, with slight alteration, are from Middle- 

 kauff, 1950. 



