504 PROCEEDINGS OF THE ACADEMY OF [Sept., 
Antennse longer, the flagellar segments not constricted beyond 
the basal enlargement; three brown stripes on the mesonotal 
prajscutum; male hypopygium with the ninth tergite having 
the caudal margin deeply and broadly notched medially; 
ninth pleurite incomplete; lobes of the caudo-lateral angles 
of the ninth sternite not pendulous, directed entad; eighth 
sternite without lobes on the caudal margin dieiziana sp. n. 
Tipula cunctans Say. 
Tipida cundans Say; Journal of the Academy of Natural Sciences of Phila- 
delphia, vol. 3, p. 23 (1823). 
Tipula casta Loew; Entomologische Zeitschnft, vol. 7, p. 289 (1863). 
Tipula infuscata Loew; Entomologische Zeitschrift, vol. 7, p. 289 (1863). 
There can be no doubt but that the three names given above 
represent one and the same species. Under the series of cunctans 
determined as such by Loew, there appears a specimen which bears 
a manuscript label in Loew's writing and this label is "infuscata." 
The type-series of casta and infuscata, as well as the series of cunctans, 
all bear the same manuscript number given to the specimens by 
Osten Sacken (No. 95). In the series of Tipula cunctans there are 
two females dated October 20; it is well known that infuscata is one 
of the few autumnal species of Nearctic Tipula, and this data in 
regard to cunctans only confirms the synonomy of the species. 
The Bicornis Group. 
The small group of species that constitute this division seem to 
show the following characters and tendencies: The nasus is very 
short to indistinct; the coloration is yellow or brownish yellow 
with the thoracic stripes usually distinct; the body is provided with 
abundant short hairs on the head and on the thoracic interspaces. 
The venation shows the cell 1st M^ very small and pentagonal (larger 
and more elongated in johnsoniana). The male hypopygium has 
the ninth tergite tumid (very slightly so in parshleyi), unarmed or 
provided ^^dth horns (unarmed in johnsoniana; two horns in bicornis 
and mdrrisoni'; four horns in megaura); the ninth pleurite com- 
plete; the outer pleural appendage tending to be reduced to a 
very tiny lolje; the inner pleural appendage large, elongate to 
subquadratc; the gonapophyses subtending the penis-guard, and 
about half its length (in morrisoni, megaura, etc.) to fully the length 
of the penis-guard {in johnsoniana) . The female ovipositor with the 
valves short, blunt and subfleshy, little chitinized. Our species 
may be separated in the male sex by the following key : 
1. Ninth tergite not tumid; eighth sternite very long, sheathing the 
ninth sternite beneath, the tip with two chitinized points on 
each side parshleyi sp. n. 
