930 CHARLES PauL ALEXANDER 
same type of situations as does the preceding species — beneath bridges, 
culverts, in crannies of cliffs, on the inclined sides of boulders along 
mountain streams, and in similar places. Their position when at rest 
is very different from that of Dolichopeza americana, as they hang from 
the roof by the front pair of feet only, the other legs dangling and the 
wings being folded over the abdomen. In this last-named feature they 
differ conspicuously from the often-associated Dolichopeza. The immature 
stages are spent in moist earth, or (in the case of O. obscura) in a dry moss, 
Hedwigia albicans, where they were first discovered by Hyslop. The 
larvae are sluggish and of a rather dark green color. The following 
key is adapted from one given by Johnson (1909:117-118): 
1. Tarsi, at least; entirely white. : 2. 2.020)) 2. og. shod os ei en ee eee 2 
Tarsi yellow or brownish’... o.55):0d.ci-s/eeesaels onic nee. olelg os oe Ree 3 
2. Digitiform appendages of male genitalia short or rudimentary; ventral margin deeply 
and narrowly emarginate. [Proc. Boston Soc. Nat. Hist., vol. 34, p. 121, pl. 15, fig. 12. 
1 (S10 ee Seine iene ae ena Mann a Heer an hob hac occ 0. albipes Johns. 
Digitiform appendages of male genitalia moderate in length; ventral margin broadly 
emarginate. [Proc. Boston Soc. Nat. Hist., vol. 34, p. 131= —122, ple 15; “figs. aul. 
1909 3223s eee Sa ta ee ee OE ee 0. subalbipes Johns. 
3: Halteres withthe knobs dark browm.......-.s06 +00 once ee ee 4 
Halteres:entirely. yellow). 3 .c:.:422..b ee au eke Sew oc oon os ee ee eee Tal 
4. Stripes of thorax distinct; ventral margin deeply emarginate......................... 5 
Stripes of thorax obscure; ventral margin but slightly emarginate.................... 6} 
5. Pleura yellow, unspotted. [Proc. Boston Soc. Nat. Hist., vol. 34, p. 119-120, pl. 15, 
fee Gs: UGOO Ie Re Basa ve oie ek eee Oe O. dorsalis Johns. 
Pleura yellow, spotted. [Proc. Boston Soc. Nat. Hist., vol. 34, p. 120, pl. 15, fig. 9. 
2210)9 te eeerea ie eerie ah dere aero mM RR Nes atid Guo oa oo O. venosa Johns. 
6. Thorax opaque. [Proc. Boston Soc. Nat. Hist., vol. 34, p. 122, pl. 15, figs. 7, 10. 1909.] 
(Plate SORT. 186) ese en. eee eee O. obscura Johns. 
Thorax shining. [Proc. Boston Soc. Nat. Hist., vol. 34, p. 122-123, pl. 15, fig. 8. 
TODO TRE ES A IR eS ee RUE SRO ae Gers ae O. obscura polita Johns. 
7. Ventral margin of male genitalia deeply and narrowly emarginate. [Proc. Boston Soc. 
Nat. Hist., vol. 34, p. 118-119, pl. 15, figs. 2, 3, 1909. New name for Tipula annu- 
lata Say, Journ. Acad. Nat. Sci. Phila., vol. 3, p. 25 (1823), preoccupied.] 
O. sayi Johns. 
Ventral margin broadly emarginate. [Proc. Boston Soc. Nat. Hist., vol. 34, p. 119, 
pls 15; figs 4.) E909 Jents Sere Gis RY A Sine O. similis Johns. — 
Tribe Ctenophorini 
The following key separates the two genera of the tribe Ctenophorini: 
Antennae of male with three pectinations on the flagellar segments, each segment with a 
single pectination on the apical half in addition to the usual basal pair; ovipositor of female 
greatly elongated, ysaber-like 0.5.0 hija ge so oye ts tec era Tanyptera Latr. (p. 931) 
Antennae of male with two pairs of pectinations on the flagellar segments, one pair being 
subbasal and the other subapical; ovipositor of female short and of the normal tipuline 
SLUGCUTES pecs io cic MR es seco skoverere eitisehoes etedotel ciel tole clown cen ener Ctenophora Meig. (p. 931) 
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