KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 22. N:0 7. 337 



The reasons why I have given Dairella Bovallii as a synonym for D. latissima 

 will be easily appreciated, I think, on a comparison of my description given here with 

 that of the former species by Stebbing. 



Of this species I have examined several specimens, males as well as females. 



T li e male. 



PL XV, fig. 1—15. 



The body is almost as broad as in the female of the preceding species. The head 

 and peraeon together are a little shorter than the pleon, the urus, and the last pair of 

 uropoda together. 



The head is almost globular, but not inflated, and does not rise above the dorsal 

 line of the perseon; it is a little broader and deeper than long, and is not fully as long 

 as the first two pergonal segments and half the third together. 



The eyes are distributed as in the preceding species. 



The first pair of antennae (PI. XV, fig. 2) reach beyond the hind margin of the 

 last pergonal segment. The peduncle is thick and robust; the first joint is longer than 

 the two following together; the third is longer than the second. The first joint of the 

 flagellum is thick and tumid, about as long as the whole peduncle, and is densely set 

 with long, olfactory hairs on the inner and under sides; the second joint is short, the 

 third is twice longer; the fourth and following are still longer, and subequal in length. 

 The flagellar joints are sixteen or eighteen in number. 



The second pair of antenna? (PI. XV, fig. 3) are not fully as long as the first, and 

 reach nearly to the hind margin of the last peraeonal segment. The first free joint of the 

 peduncle is very short; the second is as long and broad as the third; the first flagellar 

 joint is considerably longer than the last peduncular joint; the following are shorter, 

 subequal in length, and are fringed on the under margin with very short hairs. The fla- 

 gellar joints are about twenty in number. 



The labrum (PI. XV, fig. 4) is unsymetrically bilobed, the lobes are set with mi- 

 nute hairs. 



The mandibles (PI. XV, fig. 5) are tolerably long. The incisive lamina is feebly 

 bent, sharply serrated on the edge, with numerous small teeth; the secondary lamina of 

 the left mandible is somewhat smaller than the principal, and is armed with only half a 

 dozen small teeth. The molar tubercle is large, thick, and strongly denticulated. The 

 outer side of the mandibles is evenly convex and smooth. 



The labium is broad; the lateral lobes are feebly projecting and irregularly rounded. 



The first pair of maxilla (PI. XV, fig. 6) have the apical part of the principal 

 lamina tongue-like, armed with four spine-like teeth, and fringed with slender, short hairs. 

 The secondary lamina is broad at the apex, armed with a single tooth, and fringed with 

 short hairs. 



The second pair of maxilla? (PL XV, fig. 7) are comparatively small. The apical 

 part of the principal lamina is narrow, linear rounded at the apex, and fringed with min- 



K. Sv. Vet. Akad. Handl. Baud. 22. N:o 7. 43 



