46 MISCELLANEOUS STUDIES 



KEY TO CALIFORNIA SPECIES 



1. Beak reaching considerably beyond the third coxa 2 



Beak at most barely reaching to the third coxa 8 



2. Beak reaching almost to or. even beyond the tip of the abdomen 3 



Beak not reaching to the tip of the abdomen 4 



3. First joint of hind tarsus more than one-third as long as the second joint. 



Legs black except the base of the femora and a broad ring near the base 

 of the tibiae ponderosa Williams 



First joint of hind tarsus scarcely more than one-fourth as long as the second 



joint. Legs pale at the base of the femora and tibiae, black at tips. 



oregonensis Wilson 



4. Body exceptionally Jarge, being over 4 mm. long, usually about 5 mm., and 



over 2 mm. wide _ 5 



Body of average size, being from 2.5 mm. to 3 mm. long, and from 0.75 to 



1.2 mm. wide 7 



5. Third segment of antennae with many sensoria (eight or more), (figs. 88, 



89) 6 



. Third joint of antennae with but few or no sensoria, at most with one or two. 

 First joint of hind tarsus a little less than half as long as the second. 

 On Pinus sdbiniana sabinianus n.sp. 



6. Third joint of antennae with about 8-12 sensoria (fig. 88). Tibiae with a pale 



ring near the base. First joint of hind tarsus scarcely more than one-third 

 the length of the second. On Picea sp vanduzei n.sp. 



Third joint of the antennae with 19-20 sensoria (fig. 89). Tibiae without 



pale ring near base. First joint of hind tarsus almost one-half the length 

 of the second. On Pinus sp. and Abies sp ferrisi Swain 



7. Beak not reaching to the middle of the abdomen. Segment three of the 



antennae almost as long as the fourth, fifth, and sixth together. Apex 

 of stigma meeting the margin of the wing in an acute angle, and not 

 terminated by a distinct vein (fig. 92). On Pseudotsuga taxifolia. 



pseudotsugae Wilson 



Beak reaching beyond the middle of the abdomen. Third antennal segment 



not nearly so long as the fourth, fifth, and sixth together. Apex of stigma 

 meeting the wing margin in an obtuse angle, and terminated by a distinct 

 vein (fig. 93). Apterous viviparous females with a distinctive pattern on 

 dorsum of abdomen. On Thuya occidentalis tujafilinus (Del Guercio) 



8. First joint of hind tarsus longer than one-fourth the second 10 



First joint of hind tarsus less than one-fourth the second 9 



9. Third antennal segment without sensoria (fig. 94). Body robust, being of the 



usual Lachnus shape. Third discoidal twice-branched, only occasionally 

 once-branched. On Abies grandis occidentalis Davidson 



Third antennal segment with several irregular sensoria (fig. 95). Body long 



and narrow, being somewhat the shape of Essigella calif ornica (Essig). 

 Third discoidal simple or once-branched. On Pinus sp. 



pini-radlatae Davidson 



10. Cornicles very poorly developed, seemingly absent in some cases (fig. 103). 

 Segment three of antennae with five-seven large circular sensoria which are 

 hardly distinguishable (fig. 106). On Pseudotsuga taxifolia. 



taxifolia Swain 



Cornicles normal (fig. 97), being quite conspicuous. Third antennal segment 



with two-four clearly defined sensoria (fig. 101). On Picea glehni. 



glehnus Essig 



