52 Prof. T. D. A. Cockerell on the 
Formula 6 3 2 (15) 4. Anal ring with six bristles; caudal 
tubercles not at all produced, each bearing a bristle about the 
size of bristles of anal ring. 
Hab. Las Vegas, N. M., April; rarely, with Zasius 
americanus. 
I have seen an ant wildly rushing about with one in its 
jaws. By its convex shape, together with the orange colour, 
this species is very different from all the others. First found 
by Wilmatte P. Cockerell. 
Ripersia Cockerelle, King, ined. 
Hab. Beulah, N. M., about 8000 feet, with Lastus niger 
neoniger, Kimery. 
Antenne 7-jointed. 
Ripersia confusella, sp. n. 
6 .—Length of body 1300-1550 w; antenne 660 w; wing 
1150 w; cottony tails about 700 w. Dull greyish brown to 
pale pink, antennee and legs almost white; dorsum of thorax 
pale, with a yellowish tinge, no distinct vitte ; wings very 
white; mesosternum whitish; middle of abdomen pale. 
Head seen from above large, triangular, broadest behind the 
eyes, which are small and dark crimson. Males discovered 
by Wilmatte P. Cockerell, April 23. 
? .—Pale pink, varying to pale yellowish, without lateral 
tassels; small caudal tassels present. The young larve are 
pale yellowish; half-grown individuals which have just 
moulted appear bright pink. Adult (with eggs forming) 
about 2 millim. long; antenne 6-jointed, formula 631254; 
joints: (1) 33, (2) 30, (8) 45, (4) 21, (5) 27, (6) 60. 
Middle legs :—femur + trochanter 150; tibia 105; tarsus * 66. 
2 (penultimate stage).—Antennal joints :—(1) 36, (2) 33, 
(3) 39, (4) 24, (5) 38, (6) 75. Middle legs :—femur + tro- 
chanter 132; tibia 65; tarsus 60. The antennee and tarsus 
of this stage are about as in the adult, but the femur and 
tibia are shorter. ‘he antennal measurements are variable 
to some extent, but on the whole remarkably constant in a 
considerable series. 
Figg.—Pale ferruginous, oval; 650 mu long. 
Hab. Las Vegas, N. M., about 6400 feet, very abundant, 
in nests of Lasius americanus ; also at Trout Spring, Sapello 
Canon, April 27. 
The ants collect large piles of the eggs, from which we 
found the larves hatching in enormous numbers. 
* All measurements of the tarsus are without the claw. 
