1963] 
Sweet — Ligyrocoris 
21 
2. Basal hind tarsal segment only twice combined length of distal 
segments (.67:. 33 mm.) ; size small (length, 4.77 to 5.18 mm.) ; 
post median transverse fascia on corium not attaining lateral mar- 
gin of corium ; metapleura never inflated, invisible from above 
car icis n. sp. 
Basal hind tarsal segment nearly three times combined length of 
distal segments (.92:. 34 mm.) ; size larger (5.16 to 7.47 mm.) ; 
post-median transverse fascia either present or nearly absent, but 
if evidently present then attaining corial margin; metapleura in 
male frequently inflated and visible from above 3 
3. Post-median transverse fascia fuscous and broadly attaining lateral 
margin of corium; labial segment III longer than I (.70 1.63 
mm.) ; pale spot at mesal angle of corium faint or absent; basal 
and apical pale spots on membrane never confluent; fore femora 
usually fuscous sylvestris (Linnaeus) 
Post-median transverse fascia weak, ferrugineous, often absent; 
labial segment III shorter than I (.57:. 67 mm.) ; pale spots at 
mesal angle of corium distinct ; basal and apical pale spots on 
membrane usually confluent, fore femora usually light yellow 
brown depictus Barber 
The above key does not include L. obscurus, L. litigiosus, L. abdo- 
minalisj L. multispinus , and L. slossoni which have a more southern 
distribution and are adequately separated in Barber’s original keys, 
or Torre-Bueno’s (1946) adaptation of it. As discussed by Ashlock 
( 1957) the aedeagal spines will prove very useful in establishing group 
relationships in this genus, but they are of little value in distinguishing 
the species included in the above key. 
Acknowledgements 
I wish to express my grateful thanks to Dr. R. C. Froeschner 
(United States National Museum) for a loan of specimens and to 
Dr. James A. Slater (University of Connecticut) for allowing me to 
use his extensive collection and for critically reading the manuscript. 
References Cited 
Ashlock, P. D. 
1957. An investigation of the taxonomic value of the phallus in the 
Lygaeidae (Hemiptera-Heteroptera) . Ann. Ent. Soc. Araer. 50: 
407-426. 
Barber, H. G. 
1921. Revision of the genus Ligyrocoris Stal (Hemiptera, Lygaeidae). 
Jour. N. Y. Ent. Soc. 29: 100-114. 
Torre-Bueno, J. R. 
1946. A synopsis of the Hemiptera-Heteroptera of America north of 
Mexico. Part III. Family XI. Lygaeidae. Ent. Amer. 26(1-3): 
1-141. 
