26o CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [BuU. 



The sexes are apterous and much smaller than the other forms. 

 A complete description of this species is given by Baker (i9i6h). 



Food plants : The early spring and late fall forms are found on 

 Cornus spp. The summer forms on the roots of various grasses 

 and weeds. 



Dilachnus Baker. 



Key to Species. 



1. Hairs on hind tibiae long and erect 2 



Hairs on hind tibiae reclinate or if erect, erect along the base of 



the tibiae only 4 



2. Hairs on hind tibiae not numerous and heavy spine-like. (On 



pines) 3 



Hairs on hind tibiae numerous and setaceous not heavy, spine-like. 

 (On spruce.) pinicola 



3. Base of angle formed by branch one and two of the median vein 



extending well beyond the base of the radial sector pini 



Base of angle formed by branch one and two of the median vein 

 not extending beyond the radial sector inoptis 



4. Hairs on hind tibiae short and erect along the base and reclinate 



toward the tip of the tibiae 5 



Hairs on hind tibiae entirely reclinate 6 



5. Hairs on tibiae long and slightly inclined to be reclining at the base 



of the tibiae atlantica 



Hairs on tibiae short and decidedly erect along the base of the 

 tibiae gracilis 



6. Hairs on hind tibiae distinctly spine-like and straight not abundant 7 

 Hairs on hind tibiae strongly reclinate, setaceous and with a droop- 

 ing appearance. Usually very abundant, giving the tibiae a 

 feathery or plumose appearance 8 



7. Sixth antennal segment long and slender, spines on tibiae long and 



strongly spine-like pergandii 



Sixth antennal segment short and stout, spines on tibiae short and 

 spine-like laricis 



8. Hairs strongly reclinate, drooping, quite long ^ 9 



Hairs strongly reclinate, drooping, very short curvipes 



9. Sixth antennal segment long and slender .strobi 



Sixth antennal segment short and stout pinivora 



D. inoptis (Wilson). Lachniella inoptis Wilson. 



Can. Ent., li, 18, 1919. 



Apterous viviparous female: Antennae light at the base and 

 dusky at the tip. Femora of all legs dark, front tibiae entirely 

 black. Tibiae on middle and hind pair of legs light colored at the 

 base and black over the distal tv^o-thirds. Antennae long and 

 sleno'er, the sixth segment finger-like and slightly shorter than the 

 fourth. Third segment approximately equal to the fourth and 

 fifth together; fifth considerably larger than the fourth. Third 

 and fourth segments vi^ithout sensoria, fifth with one large sen- 

 sorium at the distal end. Cornicles with a large acutely sloping 

 base. Cauda ans^ular, anal plate slightly dished. Hairs on 

 antennae, legs and body distinctly spine-like and long. 



