ARGIA. 73 
CC. Black dorsal stripes on segments 8 and 9 more or less confluent 
with each other, four antenodal cells on the front wings. 
D. Mesepisternal tubercles present but small, four antenodal cells on 
the hind wings, segment 10 paleon dorsum. - - . - + + - 9. ulmeca. 
DD. Mesepisternal tubercles absent, three antenodal cells on the 
hind wings. 
E. A pale mid-dorsal stripe on segments 3-5, 10 black on dorsum, 
with a pair of small pale spots... - - + es es 11. oculata. 
EE. A pale mid-dorsal stripe on segment 3 only, or absent altogether. 
F. Segment 10 pale on dorsum, labrum black, wings clear. . . 16. difficilis. 
FF, Segment 10 black on dorsum, labrum pale, wings yellow 
orsmoky 2. ee eet tt 14, indicatriz. 
BB. These markings consisting of two stripes as long as segment 8 and 
nearly as long as 9; five antenodal cells on the front wings, four on 
the hind. 
G. Mesepisternal tubercles well developed. 
H. Segment 10 pale, with a pair of brown or black spots on dorsum . 5. transtlata. 
HH. Segment 10 pale, unspotted on dorsum. 
J. Thoracic dorsum with no coppery-red reflection . . . - + - 6. tezpi. 
JJ. Thoracic dorsum, and usually the vertex, nasus, and labrum | 
also, with a coppery-red reflection . - - + + + + s+: 17. cuprea. 
GG. Mesepisternal tubercles absent; segment 10 pale, unspotted on 
dorsum. Thoracic dorsum and vertex with some coppery reflection. 
Labrum with some dark metallic colouring at base . . . . . 18. cupraurea. 
Labrum yellow, with no metallic colouring . re 8°20 2002/2 
AA. Dorsum of segments 8 and 9 black, a pale line on 3-6, 10 pale on dorsum, 
no mesepisternal tubercles... + - + +s hos tot ot ots (tibialis, Rambur*. | 
AAA. Dorsum of segment 8 black, a pale blue spot either side at base; 9 blue 
on dorsum; no mesepisternal tubercles . - - + + + + > . 18. popoluca. 
AAAA. Dorsum of segment 8 blue, of 9 black, with apical half (or a pair of 
' apical spots) blue; a pale mid-dorsal stripe on 3.and 4 at least, 10 black; 
mesepisternal tubercles present. - 6 6 - + se toe th ott 28. vuriabilis. . 
AAAAA. Dorsum of segments 8 and 9 pale, unspotted, antenodal cells three 
onallwings. ©. 2. 6) ee ee eh es , . . . 8. pulla. 
§ II. Dorsum of abdominal segments 3-6 chiefly pale. 
1. Postbasal black stripes present on segments 3-6, and confluent with the 
apical black (except on 3 and 4 in A. tonto). (Some specimens of A. vio- 
lacea, A. extranea, and A. vivida will fall here, instead of under “2.’’) 
Mid-dorsal and humeral black stripes reduced to mere lines or absent, 
mesepisternal tubercles present. . . - + ss sot tonto 4. mesta. 
Mid-dorsal and humeral black stripes present, mesepisternal tubercles 
absent . - - - ee ee ee 24. lacrymans and [tonto*]. 
2. Postbasal black stripes present on segments 3- or 4-6, but not usually . 
confluent with the apical black. 
BIOL. CENTR.-AMER., Neuropt., January 1902. . | 
