108 PROCEEDIlSrGS OF THE jSTATIONAL MUSEUM. vor . .iO. 



lobe, and one outside the second and third lobes, ventrally with a 

 similar spine corresponding to each of these except the median ; with- 

 out marginal incisions with thickened edges or chitinovis paraphyses ; 

 anal opening nearly circular, placed close to the anterior apex of the 

 pygidium ; paragenitals wanting ; marginal pores present, one above 

 and anterior to the first and second lobes, sometimes with another 

 between these two, two inside the third lobes and one just within the 

 marginal notch ending the pygidium; dorsal pores present, rather 

 numerous, more or less definitelj' grouped, but not in conspicuous 

 rows of closely set pores, three or four anterior to and between me- 

 dian lobes, perhaps fourteen altogether anterior to and between first 

 and second lobes, perhaps four or six between second and third lobes, 

 about five or six next to notch terminating pygidium ; without any 

 distinct internal thickenings; no ventral micropores noted, this per- 

 haps due to condition of specimens examined ; with some small ven- 

 tral surface setae. 



Intermediate stage female. — Differing from the adult chiefly in the 

 smaller size and in the reduced development and numbers of the struc- 

 tures described for the adult. 



Larva. — Oval, antennae 6-segmented, the terminal annulate, legs 

 normal, slender, with a pair of large long tubular double gland tubes 

 near the anterior end of the body ; margins of the abdominal segments 

 with small single gland spines alternating with tiny setae; apex of 

 abdomen with a median pair of tiny lobe-like protuberances, then 

 the apical seta and a gland spine, then a relatively large lobe, then 

 a rather large gland spine, followed by another lobe, and well beyond 

 this another gland spine. 



Gotype.—C2it. No. 24779, U.S.N.M. 



The following generic diagnosis has been prepared from the de- 

 scription of the type species : 



GENERIC DIAGNOSIS OF ALLANTOMYTILUS. 



Diaspine forms most closely related to, if not identical with, Coc- 

 comytUus and Lepidosaphes ; scales elongate, exuviae terminal, scale 

 strongly corrugated transversely ; adult female mytilaspiform, with 

 minute antennae ; margins of cephalothorax and abdominal segments 

 with tubular ducts and small setae; abdominal segments also with 

 some marginal gland spines; pygidium very short, apical margin 

 nearly truncate; with small, widely separated lobes, gland spines, 

 normal marginal setae, no incisions or chitinous paraphyses, anal 

 opening nearly circular, near anterior edge of pygidium, marginal 

 and dorsal pores present, axis longitudinal ; intermediate stage simi- 

 lar but with structures less developed; young larva oval, antennae 

 6-segmented, terminal annulate, legs normal, slender, anterior apex 



