ALBERT F. SWAIN 11 



sensoria, eleven had four, two had five, and one had six. On segment III 

 (fig. 18) there are from fifteen to twenty-one secondary sensoria extending 

 from the apex to the base. Of eighteen segments examined five had fifteen 

 sensoria, one had sixteen, nine had seventeen, one had eighteen, one had 

 nineteen, and one had twenty-one. The modal number of sensoria on III is 

 therefore seventeen. These secondary sensoria are quite large, circular, and 

 located in an even line along the segments. The beak is fairly long, reach- 

 ing usually to the middle of the abdomen, although in some cases it may 

 reach to the base of the cauda or even slightly beyond the end of the body. 

 The cornicles (fig. 25) are quite large for Lachnus, being of the typical cone- 

 shaped form. The cauda is typical, being half-moon shaped and not separated 

 from the abdomen. The first joint of the hind tarsus is about half as long 

 as the second joint. This is an extremely large-sized species, being about 

 four millimeters in length and two in width. 



Measurements: Body length, 3.32-5.78 mm. (ave. 3.723 mm.): width of 

 thorax, 1.33-1.67 mm. (ave. 1.492 nmi.): aiftennae total, 2.67-3.21 mm. (ave. 

 2.937 mm.); Ill, 1.09-1.28 mm. (ave. 1.182 mm.); IV, .5-.56 mm. (ave. .519 

 mm.); V, .51-64 mm. (ave. .569 mm.); VI, .23-.28mm. (ave. .271 mm.): width 

 of cornicles at base, .357-.425mm. (ave. .3825 mm.); width at apex, .102 mm.; 

 apparent height, .187-. 225 mm. (ave. .221 mm.): first joint hind tarsus, .137- 

 .19 mm. (ave. .1632 mm.); second joint, .289-.374 mm. (ave. .3502 mm.): wing 

 length, 5.1-5.86 mm. (ave. 5.653 mm.); wing expansion, 12.24-13.175 mm. 

 (ave. 12.708 mm.). 



Aplerous viviparous female. — -These arc brown mottled with black, and 

 slightly pruinose. The antennae are dusky, except III, which is pale with the 

 apex dusky, and the bases of IV and V, which are pale. On III there are 

 seven or eight large, circular sensoria on the apical one-third (fig. 19), on IV 

 there are four, on V two, and on VI one. The one on VI and the distal one 

 on V are the usual primary sensoria, the others being secondary sensoria. The 

 beak is similar to that of the alate reaching beyond the middle of the abdomen 

 to about the base of the cauda or slightly farther. The thorax and abdomen 

 are dark bro^vn mottled with black. The coxae are black, as well as the tibiae, 

 the tarsi, and the femora, except the basal one-third or one-fom-th, which is 

 amber colored. The cornicles are smaller than the alates, yet conspicuous, 

 and are black. Measurements of one specimen are: body length, 4.75 mm.: 

 width, 2.5 mm.: antennae total, 2.94 mm.; Ill, 1.14 mm.; IV, .54 mm.; V, .62 

 mm.; VI, .25 mm. 



Lachnus taxifolia new species (Figs. 10, 20, 20, 27.) 



Ill August U)12, E. O. Essig collected a large imiuber of speci- 

 mens of a species of Lachnus on Douglass fir (Pseudotsuga taxi- 

 folia) in Capitol Park, Sacramento. George Shinji found the 

 same species more or less abundantly on Douglass fir in Berkeley 

 and in (lolden Gate Park, San Francisco, throughout the spring 

 and early summer of 1915. Spechiiens were sent to Davidson, 



TRANS. AM. ENT. SOC, XLIV. 



