16 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
Intermediate stage female—Elongate oval, slightly broader behind, 
convex, maximum length 9.5 mm., width 4.5 mm. dull brown; segmen- 
tation distinct; antennae 8-segmented; legs somewhat stouter than 
those of adult, beak similar, spiracles similar, but with fewer pores; 
derm pores, spines and setae similar in appearance and arrangement 
to adult except that the marginal setae appear longer, that there is 
no marginal abdominal band of setae, that the large tubular pores 
appear to be lacking and that there are from one to three of the 
long tubular pores behind each abdominal spiracle, and a similar 
number at the margin of the anterior body segments; anal tube and 
ventral cicatrices much as in the adult. 
No other stages available for examination. 
Holotype and paratypes—Cat. No. 25270, U.S.N.M. 
This species has been described from two adult and one immature 
females mounted on slides, and from three unmounted alcoholic spec- 
imens collected on the roots of Eucalyptus, species, at Adelaide, South 
Australia, in 1888 by Mr.Albert Koebele, listed under ‘‘Div. Ent. 
No. 4390.” 
Certain pronounced differences, notably in the presence or absence 
of trilocular tubular and large circular pores, as described, are to be 
observed in the forms described here as adult and pre-adult fe- 
males. However, the smaller size, the reduced number of antennal 
segments, the general resemblance in the relative number and arrange- 
ment of the pores and setae, the absence of any concentration of 
disk pores in the region of the genital opening, such as is found in 
the adults of all the species of the genus including this one, and 
finally the collecting of the specimens together, all argue in favor of 
the relationship indicated. 
It is unfortunate that no larvae of this species have been available 
for comparison with those of other species of Monophlebulus. The 
adult female of this species diverges much more widely from the char- 
acteristic structural condition of the genus than does any of the other 
species, and without the the location of the trilocular tubular pores 
in the immature form its assignment to this genus would have been 
open to question. The main points of difference distinguishing this 
species from others of the genus are indicated in the key which follows. 
The addition of four species, including two with known males, to 
this genus makes it necessary to alter to some extent the generic 
diagnosis given in a previous paper, and to add a diagnosis of the 
male stage to it. The following is therefore given as a revised char- 
acterization of this genus: 
Monophlebine forms living on Hucalyptus, adult female elongate 
ovate, covered with more or less loose white secretion usually con- 
