50 THE NORTH AMERICAN SPECIES OF DROSOPHILA. 
3. Costa pectinate; vibrisse large; two large orbitals..................... Curtonotum 
Costa not pectinate; vibrisse and lower orbital minute or missing.......... Apsinota 
Arista MUNUbELY ;OUDEACEMB? oo take ee eile emcee ee ec aray anae ea ey eartarerty, catmee Nie 5 
PATIStANPLEMNORE hI SI YN URI cen aay AR Lt a aera nN ANU a) 9 
Arista short pectinate; no prescutellars; bristles large.................. Titanocheta 
Arista bare except for one long branch at base; no prescutellars; postverticals 
of 012i eee 8 aaa POP Rr by MIR aU Ea ADR CASEY A el 4) ty ahha id Cladocheta 
5. No ocellar or preapical bristles; one pair of dorsocentrals; prescutellars present. 
Acletoxenus 
Ocellars RESO 21rd Da eisia pin Nssel eis eteie. Cave eal ees usher ene fe 6 
6. Four pairs of dorsocentrals; a long propleural; two orbitals......... Blesochetophora 
One or two pairs of dorsocentrals; three orbitals... .............0.000 eee cuees fi 
7. Discal and second basal cells separated; front not unusually hairy..... Sinophthalmus 
Discal and second basal cells confluent; front with numerous small hairs........ 8 
8. Carina large; costa weak between third and fourth veins.................... Gitona 
Carina small; costa well developed to apex of fourth vein.............. Pseudiastata 
9. An extra cross-vein between third and fourth veins, near posterior cross-vein.. . [diomyia 
Only anterior cross-vein between third and fourth...................e0eeeees 10 
10. Proboscis longer than height of head; head broader than thorax.......... Zygothrica 
Proboscis shorter than head; head broad only in a few species of Chymomyza.... 11 
11. Two pairs of presutural dorsocentrals; distal costal break very deep..... Dettopsomyia 
No presutural dorsocentral macrochsets:. 2. /5)- a-ak cose sw os bee de oa ieee 12 
12. Mesopleurz bristly; anal cell open at apex; metallic-colored species.......... Camilla 
Mcsopleurst bare sere ke cla et nees dad A Re Baca pet ee 13 
13. Discal and second basal cells separated; postverticals small; prescutellars large. 
Stegana 
Piscalsand ‘second! basal cells;confluent. ! 3.3 2)f 2 eee Se eee 14 
14. Lower reclinate orbital as far from proclinate as from upper reclinate........... 15 
Lower reclinate orbital nearer proclinate than to upper reclinate............... 17 
15, Prescutellars weak or absent; face and carina very prominent............. Zaprionus 
Prescutellars large: face not protuberant |... 5.02224 oe ees See eee 16 
16. Front covered with stout hairs; costa reaches fourth vein............ Pseudophortica 
Front not unusually hairy; costa weak or absent beyond apex of third vein. 
Leucophenga 
“17. Lower reclinate orbital large, placed below proclinate; postverticals usually small; 
CHER DATEORMEARLY BO) eNO gt 2 ii nail intl as Ahh Ini Walle ack eee aN ale Chymomyza 
Lower reclinate orbital small, placed above proclinate, or, rarely, a trifle below it.. 18 
18. One large pair of dorsocentrals; mesonotum and scutellum unusually convex; 
a.singleibristle’at distal costal break!) i/o ices lic se eels Mycodrosophila 
Not as above; almost always two pairs of large dorsocentrals.................. 19 
19. Acrostichal hairs in not more than four rows in front of anterior dorsocentrals, 
not more than two between the dorsocentrals; slender species with long 
scVibY "SS Taha ey SHOE ESL Oy ROR ooh RS, FORBES Loe CV Oe Arr UR ELON NEE ATER 19 Scaptomyza 
Acrostichal hairs in six or more rows in front (except in D. opaca), four or more 
SCAT) ee om ty Ree i nice A ORI ALEK ba ti Neate Sipe es Ate ae a Drosophila 
In the account of each species that I have seen is a section headed 
“‘specimens examined.” In most cases the name of the collector 
follows each locality, in parentheses. When one name appears after 
a State name for which several localities are recorded, then all the 
records for that State are from that one collector. In some cases the 
collector is unknown to me, and in these cases the museum in which 
the specimens are deposited is usually given. In a very few cases 
even this information is not supplied by my notes. Except for these 
rare cases, any record without a collector’s name is based on my own 
