MILLIPEDS OF PANAMA—LOOMIS 99 
Description: Body short and broad with 20 segments, the 
dorsum strongly convex. Head with vertex not abruptly raised 
above frontal area, surface granular with a large tubercle above each 
antennal socket; antennae clavate with joint 6 longest and thickest. 
Segment 1 with extensive expanded front margin divided into 12 
lobes ending in faint crenations; posterior margin of median portion 
weakly crenate, the disk with 10 large rounded tubercles. 
Ensuing segments each with four longitudinal rows of three tuber- 
cles but the anterior one in each row on segment 2 is transversely 
expanded, especially the two medial ones; keels of segments 2 to 5 
with three outer lobes, those thereafter with four lobes; pores on 
segments 5, 7, 9, 10, 12, 13, 15, and 16, opening from large tubercles 
projecting outward and slightly downward and backward from below 
the middle lobe of keel on segment 5 but below the third lobe there- 
after; on the poriferous keels the lobe above the tubercle does not 
project out as far as on poreless segments and its outer edge is com- 
pletely free and separate from the tubercle beneath it; keels of seg- 
ments 17 to 19 strongly produced caudally. Last segment margined 
by eight distinct seta-bearing tubercles in addition to the apex with 
its customary four setae. 
‘ Gonopods with a galeate basal joint supporting two simple, 
caudally curved branches. 
Tracheloaspis tumida, new species 
Fiaure 4b-e 
Houotypse: Male, USNM myriapod collection 2642, Barro 
Colorado Island, Canal Zone, March 8-15, 1958, E. M. and H. F. 
Loomis. 
AuLoTyPE: Female, USNM, same collection data as holotype. 
Paratypres: Male, author’s collection, same collection data as 
holotype. Canal Zone, 1 female, Monte Lirio, June 8, 1923, R. D. 
Martin. Panama, Juan Dias, June 3, 1923, O. F. Cook and H. F. 
Loomis; Alahjuela, April 13, 1925, O. F. Cook—all in author’s collec- 
tion. 
Description: Length 7 mm., width 1.5 mm. Head with labral 
area smooth and shining, the surface above it to the vertex finely, 
transversely wrinkled and with fine short setae; vertex not suddenly 
elevated above front, lacking a median grove; surface finely and 
densely granular with a larger tubercle just above each antennal 
socket; antennae as shown in figure 4). 
Segments 1 and 2 shown in figure 4c. Segments frequently with 
incrustation of organic matter obliterating the minor sculpturing, 
which consists of small inconspicuous secondary tubercles, the pri- 
